Category
page 1Impossible objects
Penrose triangle
impossible object
impossible object
two-dimensional figure representing a projection of a three-dimensional object that cannot exist
Penrose stairs
impossible object
Borromean rings
link of three loops; simplest Brunnian link
Necker cube
simple wire-frame drawing of a cube that can be perceived ambiguously with respect to the cube's orientation
impossible trident
impossible object or optical illusion
impossible cube
a visual illusion depicting an apparently impossible three-dimensional framework, invented by M.C. Escher
Waterfall
lithograph print by M. C. Escher
Ascending and Descending
1960 lithograph by M. C. Escher
Belvedere
lithograph print by the Dutch artist M. C. Escher