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The Oxford Compendium of Visual Illusions$
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Arthur G. Shapiro and Dejan Todorovic

Print publication date: 2017

Print ISBN-13: 9780199794607

Published to Oxford Scholarship Online: June 2017

DOI: 10.1093/acprof:oso/9780199794607.001.0001

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Stereokinetic Phenomena

Stereokinetic Phenomena

Chapter:
(p.597) Chapter 84 Stereokinetic Phenomena
Source:
The Oxford Compendium of Visual Illusions
Author(s):

Mario Zanforlin

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199794607.003.0084

Stereokinetic phenomena are visual illusions of three-dimensional objects produced by various drawings stuck on a platform rotating on the frontal plane. They are of theoretical interest because the phenomena cannot be explained by a “rigidity assumption” like other structures from motion, but they can be explained by a Gestalt general principle that minimizes speed differences. Other unique factors included (a) they do not appear to rotate but describe a circular translation (a movement analogous to that of a hand drawing a circle with the thumb oriented to the left and all its points moving at the same speed); (b) they appear to be three-dimensional and solid; and (c) they appear of a well-defined length in depth. This chapter discusses stereokinetic phenomena, including the related principles regarding the rigidity assumption, speed minimum difference, minimum principle, rotating figures, three-dimensional illusions, rotating circles, rotating ellipses, and rotating bar.

Keywords:   stereokinetic phenomena, structure from motion, rigidity assumption, speed minimum difference, minimum principle, rotating figures, three-dimensional illusions, rotating circles, rotating ellipses, rotating bar

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