plural of Müller-Lyer illusion

plural of Ebbinghaus illusion

plural of Ponzo illusion

plural of Pinocchio illusion

An optical illusion in which the sides of a square placed inside a pattern of concentric circles take an apparent curved shape.

plural of Ehrenstein illusion

plural of Zöllner illusion

An optical illusion in which a white area takes on a pale tint of a thin, bright, intensely colored polygon surrounding it if the coloured polygon is itself surrounded by a thin, darker border.

plural of watercolor illusion

An optical illusion where an edge between regions of the same shade causes them to be perceived as different shades.