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Prior to Verdes's invention, the 6x6x6 cube was thought to be impossible due to geometry constraints. Verdes's invention uses a completely different mechanism than the smaller Rubik's cubes; his mechanism is based on concentric, right-angle conical surfaces whose axes of rotation coincide with the semi-axes of the cube.[1] The patents for the cubes were awarded in 2004, and mass-production began in 2008. Verdes's mechanism allows cubes of up to size 11x11x11, as larger cubes have geometrical constraints.[1] References[edit] ^ a b c Slocum, Jerry (2009). The Cube: The Ultimate Guide to the World's Bestselling Puzzle. United States: Black Dog & Leventhal. ISBN 978-1-57912- |