An optical illusion (also called a visual illusion) is characterized by visually perceived images that differ from objective reality. The information gathered by the eye is processed in the brain to give a perception that does not tally with a physical measurement of the stimulus source.
There are three main types:
literal optical illusions that create images that are different from the objects that make them, physiological illusions that are the effects of excessive stimulation of a specific type (brightness, colour, size, position, tilt, movement), and cognitive illusions, the result of unconscious inferences. Pathological visual illusions arise from a pathological exaggeration in physiological visual perception mechanisms causing the aforementioned types of illusions.
Optical illusions are often classified into categories including the physical and the cognitive or perceptual, and contrasted with optical hallucinations. (Wikipedia)
Including Ponzo, Jastrow, Muller-Lye, Zollner, Poggendorff, Hering, Wundt, Orbison, Ehrenstein and Ames Room illusion.
Including Delboeuf illusion.
Including Chubb illusion and Contrast effect.
Including Bezold effect.
Including Rubin vase-face illusion.
Including Hermann grid and Scintillating grid illusion.
Including Kanizsa triangle and Ehrenstein illusion.
Including Neon Color Spreading and Watercolor illusion.
Including Pinna illusion and Leaning tower illusion.
Including The aperture problem, Barberpole illusion, Roget's ‘Palisade’ Illusion and Wagon-wheel effect.
Including Lilac chaser illusion.
Including Motion after-effect.
Including Filling-in illusion and Troxler's fading.
Including Bistable perception.
3D Illusion Art
Including "Street Painting", "Pavement Art", "Chalk Art" or "Sidewalk Art".