- 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 Bathtub Illusion
The Bathtub Illusion
- (p.238) Chapter 24 The Bathtub Illusion
- The Oxford Compendium of Visual Illusions
Lydia M. Maniatis
- Oxford University Press
As we move around a picture, the light pattern projecting from it to our eye changes. The resulting percept also changes, but the nature of these changes varies from picture to picture. The contents of the picture may appear to remain parallel to the picture plane as it slants away from us, or they may undergo changes in their apparent shape and/or their orientation relative to the picture plane. The changes are a function of the geometry of the retinal projection competing with parallax cues to flatness. Here, a bathtub in a photo undergoes a radical shape change—from long and skinny to short and stubby—as we change our viewpoint.
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