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impossible figure
An image in two dimensions of an object that, because of spatial inconsistencies, is impossible to realize fully in three dimensions. Among the best known impossible figures are the Penrose triangle, the Penrose stairway, the impossible trident, and the Freemish crate. Notable pioneers of this peculiar form of representation have been Ocar Reutersvärd, Roger Penrose (and his father), and M. C. Escher.
Related entry
• optical illusions
Related category
• ILLUSIONS AND IMPOSSIBLE FIGURES
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