What are the perceptual illusions that are valuable to psychologists?

Perceptual illusions like the Ponzo illusion or the Müller-Lyer illusion are valuable to psychologists because they reveal how our brains interpret visual information. By studying how these illusions trick our perception, psychologists can gain insights into cognitive processes such as depth perception, size constancy, and contextual effects on perception. Understanding these illusions helps researchers explore the mechanisms behind visual perception and cognition.