EntityQ601362· pop 34· linked from 62 articlesimpossible objectSign in to savetwo-dimensional figure representing a projection of a three-dimensional object that cannot existConnectionsSwedenCountrygeometryEntityInternational Standard Book NumberEntitysurrealismEntityWayback MachineEntitycubeEntitydigital object identifierEntityparadoxEntitydimensionEntityRoger PenroseEntityMarcel DuchampEntityM. C. EscherEntitylithographyEntityillusionEntitypsychologistEntityQ180686EntityMöbius stripEntityJSTOREntitypuzzleEntitynon-Euclidean geometryEntityCategoriesImpossible objectsOptical illusions