title: Some thoughts on impossible figures.
abstract: Based on an artistic analysis of the construction of "impossible figures," their structure and the origin of the perceptual effects they induce are discussed, including the use of a basic indeterminate space of intersection, penetration of indeterminate solids, and symmetry. These and other points are illustrated by 17 progressively more complex figures constructed by the author.
authors.forename: J P
authors.initials: JP
authors.lastname: Molins
mesh_terms: D001288:Attention; D003867:Depth Perception; D004193:Discrimination Learning; D006801:Humans; D009903:Optical Illusions; D009949:Orientation; D010364:Pattern Recognition, Visual; D011601:Psychophysics; D012858:Size Perception