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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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The Oppel–Kundt Illusion

The Oppel–Kundt Illusion

Chapter:
(p.303) Chapter 35 The Oppel–Kundt Illusion
Source:
The Oxford Compendium of Visual Illusions
Author(s):

Jiří Wackermann

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199794607.003.0035

A line segment, subdivided into smaller parts, appears longer than an undivided line segment of the same length. This phenomenon is known as “Oppel–Kundt illusion,” also named “illusion of interrupted extent” or “filled space illusion,” is a classic example of so-called “geometric-optical illusions.” It was described about 150 years ago but it is still insufficiently explored and not well understood. This chapter provides an overview of the research into the Oppel–Kundt illusion, summarizes the most important empirical findings and explanatory approaches, and points out relations to other illusory phenomena. The chapter also discusses results of recent original research.

Keywords:   Oppel–Kundt illusion, geometric-optical illusion, filled space illusion, illusion of interrupted extent

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