Illusions

Physical

• Distortions of scale

• Based on manipulation of monocular cues

  • Messes with depth perception

Physiological

• Visual system gets overstimulates

• Excitement or fatigue of photoreceptors

• Fatigue or overstimulation of feature detectors in the visual cortex

Cognitive

• Mismatch between what you perceive and what you sense

• Takes advantage of top-down processing and perceptual set

• Manipulation of a Gestalt principle