ILLUSIONS

Illusions are incorrect perceptions. Illusions are created when perceptual cues are distorted so that our brains cannot correctly interpret space, size, and depth cues.

PONZO ILLUSION

• Geometrical-optical illusion
• Demonstrated by Mario Ponzo in 1911.
• One explanation is "perspective hypothesis."
• Moon illusion is an example of the Ponzo illusion

MÜLLER-LYER ILLUSION

• Geometric illusion in which two lines of equal length appear unequal.
• Devised by Franz Carl Muller-Lyer, a german sociologist, in 1889.
• Used for depth of perception.
• Visual Acuity, Intertip Disparity, and averaging theory are used to explain these illusions.

Patterns are two-dimensional, and your brain treats them as three-dimensional. The way a room is shaped can dramatically change the way you perceive the room.