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A theory of art is intended to contrast with a definition of
art Art is a diverse range of human activity, and resulting product, that involves creative or imaginative talent expressive of technical proficiency, beauty, emotional power, or conceptual ideas. There is no generally agreed definition of wha ...
. Traditionally, ''definitions'' are composed of necessary and sufficient conditions and a single counterexample overthrows such a definition. ''Theorizing'' about art, on the other hand, is analogous to a theory of a natural phenomenon like
gravity In physics, gravity () is a fundamental interaction which causes mutual attraction between all things with mass or energy. Gravity is, by far, the weakest of the four fundamental interactions, approximately 1038 times weaker than the stro ...
. In fact, the intent behind a theory of art is to treat art as a
natural phenomenon A natural phenomenon is an observable event which is not man-made. Examples include: sunrise, weather, fog, thunder, tornadoes; biological processes, decomposition, germination; physical processes, wave propagation, erosion; tidal flow, and natura ...
that should be investigated like any other. The question of whether one can speak of a theory of art without employing a concept of art is also discussed below. The motivation behind seeking a theory, rather than a definition, is that our best minds have not been able to find definitions without counterexamples. The term 'definition' assumes there are concepts, in something along
Platonic Plato's influence on Western culture was so profound that several different concepts are linked by being called Platonic or Platonist, for accepting some assumptions of Platonism, but which do not imply acceptance of that philosophy as a whole. It ...
lines, and a definition is an attempt to reach in and pluck out the essence of the concept and also assumes that at least some of us humans have intellectual access to these concepts. In contrast, a 'conception' is an individual attempt to grasp at the putative essence behind this common term while nobody has "access" to the concept. A theory of art presumes each of us humans employs different conceptions of this unattainable art concept and as a result we must resort to worldly human investigation.


Aesthetic response

Theories of aesthetic response or functional theories of art are in many ways the most intuitive theories of art. At its base, the term " aesthetic" refers to a type of phenomenal experience and aesthetic definitions identify artworks with artifacts intended to produce aesthetic experiences. Nature can be beautiful and it can produce aesthetic experiences, but nature does not possess the function of producing those experiences. For such a function, an intention is necessary, and thus agency – the artist. Monroe Beardsley is commonly associated with aesthetic definitions of art. In Beardsley’s words, something is art just in case it is "either an arrangement of conditions intended to be capable of affording an experience with marked aesthetic character or (incidentally) an arrangement belonging to a class or type of arrangements that is typically intended to have this capacity" (''The aesthetic point of view: selected essays'', 1982, 299). Painters arrange "conditions" in the paint/canvas medium, and dancers arrange the "conditions" of their bodily medium, for example. According to Beardsley’s first disjunct, art has an intended aesthetic function, but not all artworks succeed in producing aesthetic experiences. The second disjunct allows for artworks that were intended to have this capacity, but failed at it (bad art). Marcel Duchamp's
Fountain A fountain, from the Latin "fons" (genitive "fontis"), meaning source or spring, is a decorative reservoir used for discharging water. It is also a structure that jets water into the air for a decorative or dramatic effect. Fountains were ori ...
is the paradigmatic counterexample to aesthetic definitions of art. Such works are said to be counterexamples because they are artworks that don't possess an intended aesthetic function. Beardsley replies that either such works are not art or they are "comments on art" (1983): "To classify them ountain and the likeas artworks just because they make comments on art would be to classify a lot of dull and sometimes unintelligible magazine articles and newspaper reviews as artworks" (p. 25). This response has been widely considered inadequate (REF). It is either question-begging or it relies on an arbitrary distinction between artworks and commentaries on artworks. A great many art theorists today consider aesthetic definitions of art to be extensionally inadequate, primarily because of artworks in the style of Duchamp.


Formalist

The formalist theory of art asserts that we should focus only on the formal properties of art—the "form", not the "content". Those formal properties might include, for the visual arts, color, shape, and line, and, for the musical arts, rhythm and harmony. Formalists do not deny that works of art might have content, representation, or narrative-rather, they deny that those things are relevant in our appreciation or understanding of art.


Institutional

The institutional theory of art is a theory about the nature of
art Art is a diverse range of human activity, and resulting product, that involves creative or imaginative talent expressive of technical proficiency, beauty, emotional power, or conceptual ideas. There is no generally agreed definition of wha ...
that holds that an object can only become art in the context of the institution known as "the
art world The art world comprises everyone involved in producing, commissioning, presenting, preserving, promoting, chronicling, criticizing, buying and selling fine art. It is recognized that there are many art worlds, defined either by location or alte ...
". Addressing the issue of what makes, for example,
Marcel Duchamp Henri-Robert-Marcel Duchamp (, , ; 28 July 1887 – 2 October 1968) was a French painter, sculptor, chess player, and writer whose work is associated with Cubism, Dada, and conceptual art. Duchamp is commonly regarded, along with Pablo Picasso ...
's " readymades" art, or why a pile of Brillo cartons in a supermarket is not art, whereas
Andy Warhol Andy Warhol (; born Andrew Warhola Jr.; August 6, 1928 – February 22, 1987) was an American visual artist, film director, and producer who was a leading figure in the Art movement, visual art movement known as pop art. His works explore th ...
's famous ''Brillo Boxes'' (a pile of Brillo carton replicas) is, the art critic and philosopher
Arthur Danto Arthur Coleman Danto (January 1, 1924 – October 25, 2013) was an American art critic, philosopher, and professor at Columbia University. He was best known for having been a long-time art critic for ''The Nation'' and for his work in philosophi ...
wrote in his 1964 essay "The Artworld": According to Robert J. Yanal, Danto's essay, in which he coined the term ''artworld'', outlined the first institutional theory of art. Versions of the institutional theory were formulated more explicitly by George Dickie in his article "Defining Art" (''American Philosophical Quarterly'', 1969) and his books ''Aesthetics: An Introduction'' (1971) and ''Art and the Aesthetic: An Institutional Analysis'' (1974). An early version of Dickie's institutional theory can be summed up in the following definition of
work of art A work of art, artwork, art piece, piece of art or art object is an artistic creation of aesthetic value. Except for "work of art", which may be used of any work regarded as art in its widest sense, including works from literature ...
from ''Aesthetics: An Introduction'': Dickie has reformulated his theory in several books and articles. Other philosophers of art have criticized his definitions as being circular.


Historical

Historical theories of art hold that for something to be art, it must bear some relation to existing works of art. For new works to be ''art'', they must be similar or relate to previously established artworks. Such a definition raises the question of where this inherited status originated. That is why historical definitions of art must also include a disjunct for first art: something is art if it possesses a historical relation to previous artworks, or is first art. The philosopher primarily associated with the historical definition of art is Jerrold Levinson (1979). For Levinson, "a work of art is a thing intended for regard-as-a-work-of-art: regard in any of the ways works of art existing prior to it have been correctly regarded" (1979, p. 234). Levinson further clarifies that by "intends for" he means: " kes, appropriates or conceives for the purpose of'" (1979, p. 236). Some of these manners for regard (at around the present time) are: to be regarded with full attention, to be regarded contemplatively, to be regarded with special notice to appearance, to be regarded with "emotional openness" (1979, p. 237). If an object isn't intended for regard in any of the established ways, then it isn't art.


Anti-essentialist

Some art theorists have proposed that the attempt to define art must be abandoned and have instead urged an anti-essentialist theory of art. In ‘The Role of Theory in Aesthetics’ (1956), Morris Weitz famously argues that individually necessary and jointly sufficient conditions will never be forthcoming for the concept ‘art’ because it is an "open concept". Weitz describes open concepts as those whose "conditions of application are emendable and corrigible" (1956, p. 31). In the case of borderline cases of art and ''prima facie'' counterexamples, open concepts "call for some sort of decision on our part to extend the use of the concept to cover this, or to close the concept and invent a new one to deal with the new case and its new property" (p. 31 ital. in original). The question of whether a new artifact is art "is not factual, but rather a decision problem, where the verdict turns on whether or not we enlarge our set of conditions for applying the concept" (p. 32). For Weitz, it is "the very expansive, adventurous character of art, its ever-present changes and novel creations," which makes the concept impossible to capture in a classical definition (as some static univocal essence). While anti-essentialism was never formally defeated, it was challenged and the debate over anti-essentialist theories was subsequently swept away by seemingly better essentialist definitions. Commenting after Weitz, Berys Gaut revived anti-essentialism in the philosophy of art with his paper ‘"Art" as a Cluster Concept’ (2000). Cluster concepts are composed of criteria that contribute to art status but are not individually necessary for art status. There is one exception: Artworks are created by agents, and so being an artifact is a necessary property for being an artwork. Gaut (2005) offers a set of ten criteria that contribute to art status: ::(i) possessing positive aesthetic qualities (I employ the notion of positive aesthetic qualities here in a narrow sense, comprising beauty and its subspecies); ::(ii) being expressive of emotion; ::(iii) being intellectually challenging; ::(iv) being formally complex and coherent; ::(v) having a capacity to convey complex meanings; ::(vi) exhibiting an individual point of view; ::(vii) being an exercise of creative imagination; ::(viii) being an artifact or performance that is the product of a high degree of skill; ::(ix) belonging to an established artistic form; and ::(x) being the product of an intention to make a work of art. (274) Satisfying all ten criteria would be sufficient for art, as might any subset formed by nine criteria (this is a consequence of the fact that none of the ten properties is necessary). For example, consider two of Gaut’s criteria: "possessing aesthetic merit" and "being expressive of emotion" (200, p. 28). Neither of these criteria is necessary for art status, but both are parts of subsets of these ten criteria that are sufficient for art status. Gaut’s definition also allows for many subsets with less than nine criteria to be sufficient for art status, which leads to a highly pluralistic theory of art. In 2021, the philosopher Jason Josephson Storm defended anti-essentialist definitions of art as part of a broader analysis of the role of macro-categories in the human sciences. Specifically, he argued that most essentialist attempts to answer Weitz's original argument fail as the criteria they propose to define art are not themselves present or identical across cultures. Storm went further and argued that Weitz's appeal to
family resemblance Family resemblance (german: Familienähnlichkeit, link=no) is a philosophical idea made popular by Ludwig Wittgenstein, with the best known exposition given in his posthumously published book ''Philosophical Investigations'' (1953). It argues tha ...
to define art without essentialism was ultimately circular, as it did not explain why similarities between "art" across cultures were relevant to defining it even anti-essentially. Instead, Storm applied a theory of social kinds to the category "art" that emphasized how different forms of art fulfill different "cultural niches." The theory of art is also impacted by a philosophical turn in thinking, not only exemplified by the aesthetics of
Kant Immanuel Kant (, , ; 22 April 1724 – 12 February 1804) was a German philosopher and one of the central Enlightenment thinkers. Born in Königsberg, Kant's comprehensive and systematic works in epistemology, metaphysics, ethics, and aest ...
but is tied more closely to
ontology In metaphysics, ontology is the philosophical study of being, as well as related concepts such as existence, becoming, and reality. Ontology addresses questions like how entities are grouped into categories and which of these entities exi ...
and
metaphysics Metaphysics is the branch of philosophy that studies the fundamental nature of reality, the first principles of being, identity and change, space and time, causality, necessity, and possibility. It includes questions about the nature of conscio ...
in terms of the reflections of
Heidegger Martin Heidegger (; ; 26 September 188926 May 1976) was a German philosopher who is best known for contributions to phenomenology, hermeneutics, and existentialism. He is among the most important and influential philosophers of the 20th centur ...
on the essence of modern technology and the implications it has on all beings that are reduced to what he calls 'standing reserve', and it is from this perspective on the question of being that he explored art beyond the history, theory, and criticism of artistic production as embodied for instance in his influential opus:
The Origin of the Work of Art "The Origin of the Work of Art" (german: Der Ursprung des Kunstwerkes) is an essay by the German philosopher Martin Heidegger. Heidegger drafted the text between 1935 and 1937, reworking it for publication in 1950 and again in 1960. Heidegger bas ...
. This has had also an impact on architectural thinking in its philosophical roots.


Aesthetic creation

Zangwill describes the aesthetic-creation theory of art as a theory of "how art comes to be produced" (p. 167) and an "artist-based" theory. Zangwill distinguishes three phases in the production of a work of art: :: rst, there is the insight that by creating certain nonaesthetic properties, certain aesthetic properties will be realized; second, there is the intention to realize the aesthetic properties in the nonaesthetic properties, as envisaged in the insight; and, third, there is the more or less successful action of realizing the aesthetic properties in the nonaesthetic properties, an envisaged in the insight and intention. (45) In the creation of an artwork, the insight plays a causal role in bringing about actions sufficient for realizing particular aesthetic properties. Zangwill does not describe this relation in detail, but only says it is "because of" this insight that the aesthetic properties are created. Aesthetic properties are instantiated by nonaesthetic properties that "include physical properties, such as shape and size, and secondary qualities, such as colours or sounds." (37) Zangwill says that aesthetic properties
supervene In philosophy, supervenience refers to a relation between sets of properties or sets of facts. X is said to supervene on Y if and only if some difference in Y is necessary for any difference in X to be possible. Some examples include: * Whether t ...
on the nonaesthetic properties: it is because of the particular nonaesthetic properties it has that the work possesses certain aesthetic properties (and not the other way around).


What is "art"?

How best to define the term "art" is a subject of constant contention; many books and journal articles have been published arguing over even the basics of what we mean by the term "art".
Theodor Adorno Theodor is a masculine given name. It is a German form of Theodore. It is also a variant of Teodor. List of people with the given name Theodor * Theodor Adorno, (1903–1969), German philosopher * Theodor Aman, Romanian painter * Theodor Blue ...
claimed in his '' Aesthetic Theory'' 1969 "It is self-evident that nothing concerning art is self-evident."
Arthur Danto Arthur Coleman Danto (January 1, 1924 – October 25, 2013) was an American art critic, philosopher, and professor at Columbia University. He was best known for having been a long-time art critic for ''The Nation'' and for his work in philosophi ...
, ''The Abuse of Beauty'', Open Court Publishing, 2003, p. 17.
Artists, philosophers, anthropologists, psychologists and programmers all use the notion of art in their respective fields, and give it operational definitions that vary considerably. Furthermore, it is clear that even the basic meaning of the term "art" has changed several times over the centuries, and has continued to evolve during the 20th century as well. The main recent sense of the word "art" is roughly as an abbreviation for "
fine art In European academic traditions, fine art is developed primarily for aesthetics or creative expression, distinguishing it from decorative art or applied art, which also has to serve some practical function, such as pottery or most metalwor ...
." Here we mean that skill is being used to express the artist's creativity, or to engage the audience's aesthetic sensibilities, or to draw the audience towards consideration of the "finer" things. Often, if the skill is being used in a functional object, people will consider it a
craft A craft or trade is a pastime or an occupation that requires particular skills and knowledge of skilled work. In a historical sense, particularly the Middle Ages and earlier, the term is usually applied to people occupied in small scale pro ...
instead of art, a suggestion which is highly disputed by many Contemporary Craft thinkers. Likewise, if the skill is being used in a commercial or industrial way it may be considered design instead of art, or contrariwise these may be defended as art forms, perhaps called
applied art The applied arts are all the arts that apply design and decoration to everyday and essentially practical objects in order to make them aesthetically pleasing."Applied art" in ''The Oxford Dictionary of Art''. Online edition. Oxford Unive ...
. Some thinkers, for instance, have argued that the difference between fine art and applied art has more to do with the actual function of the object than any clear definitional difference. Art usually implies no function other than to convey or communicate an idea. Even as late as 1912 it was normal in the West to assume that all art aims at beauty, and thus that anything that was not trying to be beautiful could not count as art. The
cubists Cubism is an early-20th-century avant-garde art movement that revolutionized European painting and sculpture, and inspired related movements in music, literature and architecture. In Cubist artwork, objects are analyzed, broken up and reassemble ...
,
dada Dada () or Dadaism was an art movement of the European avant-garde in the early 20th century, with early centres in Zürich, Switzerland, at the Cabaret Voltaire (in 1916). New York Dada began c. 1915, and after 1920 Dada flourished in Pari ...
ists, Stravinsky, and many later
art movement An art movement is a tendency or style in art with a specific common philosophy or goal, followed by a group of artists during a specific period of time, (usually a few months, years or decades) or, at least, with the heyday of the movement defi ...
s struggled against this conception that beauty was central to the definition of art, with such success that, according to Danto, "Beauty had disappeared not only from the advanced art of the 1960s but from the advanced philosophy of art of that decade as well." Perhaps some notion like "expression" (in Croce's theories) or "counter-environment" (in McLuhan's theory) can replace the previous role of beauty.
Brian Massumi Brian Massumi (; born 1956) is a Canadian philosopher and social theorist. Massumi's research spans the fields of art, architecture, cultural studies, political theory and philosophy. His work explores the intersection between power, perception, ...
brought back "beauty" into consideration together with "expression". Another view, as important to the philosophy of art as "beauty," is that of the "sublime," elaborated upon in the twentieth century by the postmodern philosopher
Jean-François Lyotard Jean-François Lyotard (; ; ; 10 August 1924 – 21 April 1998) was a French philosopher, sociologist, and literary theorist. His interdisciplinary discourse spans such topics as epistemology and communication, the human body, modern art and ...
. A further approach, elaborated by André Malraux in works such as ''The Voices of Silence'', is that art is fundamentally a response to a metaphysical question ("Art", he writes, "is an 'anti-destiny'"). Malraux argues that, while art has sometimes been oriented towards beauty and the sublime (principally in post-Renaissance European art) these qualities, as the wider history of art demonstrates, are by no means essential to it. Perhaps (as in Kennick's theory) no definition of art is possible anymore. Perhaps art should be thought of as a cluster of related concepts in a Wittgensteinian fashion (as in Weitz or Beuys). Another approach is to say that "art" is basically a sociological category, that whatever art schools and museums and artists define as art is considered art regardless of formal definitions. This "institutional definition of art" (see also Institutional Critique) has been championed by George Dickie. Most people did not consider the depiction of a store-bought
urinal A urinal (, ) is a sanitary plumbing fixture for urination only. Urinals are often provided in public toilets for male users in Western countries (less so in Muslim countries). They are usually used in a standing position. Urinals can be ...
or Brillo Box to be art until
Marcel Duchamp Henri-Robert-Marcel Duchamp (, , ; 28 July 1887 – 2 October 1968) was a French painter, sculptor, chess player, and writer whose work is associated with Cubism, Dada, and conceptual art. Duchamp is commonly regarded, along with Pablo Picasso ...
and
Andy Warhol Andy Warhol (; born Andrew Warhola Jr.; August 6, 1928 – February 22, 1987) was an American visual artist, film director, and producer who was a leading figure in the Art movement, visual art movement known as pop art. His works explore th ...
(respectively) placed them in the context of art (i.e., the art gallery), which then provided the association of these objects with the associations that define art. Proceduralists often suggest that it is the process by which a work of art is created or viewed that makes it art, not any inherent feature of an object, or how well received it is by the institutions of the art world after its introduction to society at large. If a poet writes down several lines, intending them as a poem, the very procedure by which it is written makes it a poem. Whereas if a journalist writes exactly the same set of words, intending them as shorthand notes to help him write a longer article later, these would not be a poem.
Leo Tolstoy Count Lev Nikolayevich TolstoyTolstoy pronounced his first name as , which corresponds to the romanization ''Lyov''. () (; russian: link=no, Лев Николаевич Толстой,In Tolstoy's day, his name was written as in pre-refor ...
, on the other hand, claims in his ''What is art?'' (1897) that what decides whether something is art is how it is experienced by its audience, not by the intention of its creator. Functionalists like Monroe Beardsley argue that whether a piece counts as art depends on what function it plays in a particular context; the same Greek vase may play a non-artistic function in one context (carrying wine), and an artistic function in another context (helping us to appreciate the beauty of the human figure). Marxist attempts to define art focus on its place in the mode of production, such as in
Walter Benjamin Walter Bendix Schönflies Benjamin (; ; 15 July 1892 – 26 September 1940) was a German Jewish philosopher, cultural critic and essayist. An eclectic thinker, combining elements of German idealism, Romanticism, Western Marxism, and Jewish ...
's essay ''The Author as Producer'', and/or its political role in class struggle. Revising some concepts of the Marxist philosopher Louis Althusser, Gary Tedman defines art in terms of social reproduction of the relations of production on the aesthetic level.


What should art be like?

Many goals have been argued for art, and aestheticians often argue that some goal or another is superior in some way.
Clement Greenberg Clement Greenberg () (January 16, 1909 – May 7, 1994), occasionally writing under the pseudonym K. Hardesh, was an American essayist known mainly as an art critic closely associated with American modern art of the mid-20th century and a formali ...
, for instance, argued in 1960 that each artistic medium should seek that which makes it unique among the possible mediums and then purify itself of anything other than expression of its own uniqueness as a form. The
Dada Dada () or Dadaism was an art movement of the European avant-garde in the early 20th century, with early centres in Zürich, Switzerland, at the Cabaret Voltaire (in 1916). New York Dada began c. 1915, and after 1920 Dada flourished in Pari ...
ist
Tristan Tzara Tristan Tzara (; ; born Samuel or Samy Rosenstock, also known as S. Samyro; – 25 December 1963) was a Romanian and French avant-garde poet, essayist and performance artist. Also active as a journalist, playwright, literary and art critic, comp ...
on the other hand saw the function of art in 1918 as the destruction of a mad social order. "We must sweep and clean. Affirm the cleanliness of the individual after the state of madness, aggressive complete madness of a world abandoned to the hands of bandits." Formal goals, creative goals, self-expression, political goals, spiritual goals, philosophical goals, and even more perceptual or aesthetic goals have all been popular pictures of what art should be like.


The value of art

Tolstoy defined art as the following: "Art is a human activity consisting in this, that one man consciously, by means of certain external signs, hands on to others feelings he has lived through, and that other people are infected by these feelings and also experience them." However, this definition is merely a starting point for his theory of art's value. To some extent, the value of art, for Tolstoy, is one with the value of empathy. However, sometimes empathy is not of value. In chapter fifteen of ''What Is Art?'', Tolstoy says that some feelings are good, but others are bad, and so art is only valuable when it generates empathy or shared feeling for good feelings. For example, Tolstoy asserts that empathy for decadent members of the ruling class makes society worse, rather than better. In chapter sixteen, he asserts that the best art is "universal art" that expresses simple and accessible positive feeling. An argument for the value of art, used in the fictional work '' The Hitchhikers Guide to the Galaxy'', proceeds that, if some external force presenting imminent destruction of Earth asked humanity what its value was—what should humanity's response be? The argument continues that the only justification humanity could give for its continued existence would be the past creation and continued creation of things like a
Shakespeare William Shakespeare ( 26 April 1564 – 23 April 1616) was an English playwright, poet and actor. He is widely regarded as the greatest writer in the English language and the world's pre-eminent dramatist. He is often called England's natio ...
play, a Rembrandt painting or a
Bach Johann Sebastian Bach (28 July 1750) was a German composer and musician of the late Baroque period. He is known for his orchestral music such as the ''Brandenburg Concertos''; instrumental compositions such as the Cello Suites; keyboard wor ...
concerto. The suggestion is that these are the things of value which define humanity. Whatever one might think of this claim — and it does seem to undervalue the many other achievements of which human beings have shown themselves capable, both individually and collectively — it is true that art appears to possess a special capacity to endure ("live on") beyond the moment of its birth, in many cases for centuries or millennia. This capacity of art to endure over time — what precisely it is and how it operates — has been widely neglected in modern aesthetics.Derek Allan
''Art and Time''
Cambridge Scholars, 2013.


Set theory of art

A set theory of art has been underlined in according to the notion that everything is art. Here - higher than such states is proposed while lower than such states is developed for reference; thus showing that art theory is sprung up to guard against complacency.
Everything is art.Theories of Art Today By Noël Carroll Arthur C. Danto
page 11
A set example of this would be an eternal set large enough to incorporate everything; with a work of art-example given as Ben Vautier's 'Universe'.
Everything and then some more is art (Everything+)
A set of this would be an eternal set incorporated in it a small circle; with a work of art-example given as Aronsson's 'Universe Orange' (which consists of a starmap of the universe bylining a natural-sized physical orange).
Everything that can be created (without practical use) is art (Everything-)
A set of this would be a shadow set (universe) much to the likelihood of a negative universe.
Everything that can be experienced is art (Everything--)
A set of this would be a finite set legally interacting with other sets without losing its position as premier set (the whole); with a work of art-example given as a picture of the 'Orion Nebula' (Unknown Artist).
Everything that exists, have been existing, and will ever exist is art (Everything++)The Official Handbook of the Marvel Universe A-Z Vol. 2 Omniverse: A Glossary of Terms
A set of this would be an infinite set consisting of every parallel universe; with a work of art-example given as Marvels 'Omniverse'.


References

{{Philosophy topics Aesthetics Art Concepts in aesthetics Concepts in epistemology Concepts in metaphysics Theories of aesthetics