
The growing block universe theory of time (or the growing block view), states that the past and present both exist, and the future as yet does not. The present is an objective property, to be compared with a moving spotlight. By the passage of time more of the world comes into being; therefore, the block universe is said to be growing. The growth of the block is supposed to happen in the present, a very thin slice of
spacetime
In physics, spacetime is a mathematical model that combines the three dimensions of space and one dimension of time into a single four-dimensional manifold. Spacetime diagrams can be used to visualize relativistic effects, such as why diffe ...
, where more of spacetime is continually coming into being. Growing block theory should not be confused with
block universe theory, also known as eternalism.
The growing block view is an alternative to both
eternalism (according to which past, present, and future all exist) and
presentism (according to which only the present exists). It is held to be closer to
common-sense intuitions than the alternatives.
C. D. Broad was a proponent of the theory (1923). Some modern defenders are
Michael Tooley (in 1997) and
Peter Forrest
Peter James Forrest (born 15 November 1985) is an Australian former professional cricketer who played for New South Wales, Queensland and Brisbane Heat. He played in 15 One Day Internationals (ODIs) for the Australian national cricket team ...
(in 2004).
Fabrice Correia and
Sven Rosenkranz
Sven (in Danish and Norwegian, also Svend and also in Norwegian most commonly Svein) is a Scandinavian first name which is also used in the Low Countries and German-speaking countries. The name itself is Old Norse for "young man" or "young war ...
have developed their own distinctive view of this theory (2015).
The theory
Broad first proposed the theory in 1923. He described the theory as follows:
It will be observed that such a theory as this accepts the reality of the present and the past, but holds that the future is simply nothing at all. Nothing has happened to the present by becoming pas