Right-Angle Preference in Impossible Objects and Impossible Motions

Kokichi Sugihara
Proceedings of Bridges 2014: Mathematics, Music, Art, Architecture, Culture (2014)
Pages 449–452 Short Papers


There is a class of pictures called pictures of impossible objects. Although they are named “impossible,” they are not necessarily impossible. Some of them can be realized as three-dimensional solid objects. In this study, we show that the impression of impossibility comes from the human preference for right angles. This preference can also explain another visual illusion called impossible motions.