- 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 New Moon Illusion
The New Moon Illusion
- (p.283) Chapter 31 The New Moon Illusion
- The Oxford Compendium of Visual Illusions
- Oxford University Press
When the sun is near the horizon and the moon is visible and higher in the sky, there is a compelling illusion that the sun is not in a direction perpendicular to the boundary between the lit and dark sides of the moon. This New Moon illusion has been observed and discussed previously but without a complete explanation. This chapter argues that both perceptual and cognitive factors contribute to the illusion and that it arises from the fact that the straight line joining the sun and the moon describes a great circle over the flattened dome of the sky. The New Moon illusion also raises the question of how we are able to judge the straightness of extended straight and parallel lines.
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