Muller-Lyer Illusion
Length Perception
Two equal line segments appear different in length because inward and outward fins alter how the visual system interprets spatial extent.
Gallery
Famous Illusions
Standalone perceptual effects that are not tied to one specific artist. Click an illusion to open a small gallery of examples.
Simultaneous Contrast
Brightness Perception
Identical shades of gray appear lighter or darker depending on the surrounding luminance, illustrating how the visual system judges brightness relatively rather than absolutely.
Hermann Grid
Contrast Perception
Dark spots seem to flicker at white grid intersections, especially in peripheral vision, even though every intersection is actually white.