- Title Pages
- How to Use the Website
- Chapter 11 Weighted Positional Averaging in the Illusions of the Müller-Lyer Type
- Chapter 12 The Bar-Cross-Ellipse Illusion
- Chapter 13 The Spinning Ellipse Speed Illusion
- Chapter 14 The Ames Window Illusion and Its Variations
- Chapter 15 Three-Dimensional Müller-Lyer Illusion
- Chapter 16 Why Do Hills Look So Steep?
- Chapter 17 “Shape From Smear”
- Chapter 18 Geometric-Optical Illusions Under Isoluminance?
- Chapter 19 The Picture Surface Illusion
- Chapter 20 Cast Shadow Illusions
- Chapter 21 The Leaning Tower Illusion
- Chapter 22 The Invisible Saddle, or the Cap-or-Cup Illusion
- Chapter 23 Symmetry and Uprightness in Visually Perceived Forms
- Chapter 24 The Bathtub Illusion
- Chapter 25 The Pitchroom Illusion
- Chapter 26 Geometric Illusions in the Human Face and Body
- Chapter 27 Dynamic Illusory Size Contrast
- Chapter 28 Size Contrast and Assimilation in the Delboeuf and Ebbinghaus Illusions
- Chapter 29 The Occlusion, Configural Shape, and Shrinkage Illusions
- Chapter 30 Reverse-Perspective Art and Objects—Illusions in Depth and Motion
- Chapter 31 The <i>New</i> Moon Illusion
- Chapter 32 Geometrical Errors Are the Cost of Maintaining the Luminance Contrast Polarity
- Chapter 33 Antigravity Slopes
- Chapter 34 The Geometric-Optical Illusions of J. J. Oppel
- Chapter 35 The Oppel–Kundt Illusion
- Chapter 36 The Shifted-Chessboard Pattern as Paradigm of the Exegesis of Geometrical-Optical Illusions
The Oppel–Kundt Illusion
The Oppel–Kundt Illusion
- (p.303) Chapter 35 The Oppel–Kundt Illusion
- The Oxford Compendium of Visual Illusions
- Oxford University Press
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.
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