Explore All Illusions
Filter by category or difficulty — inspired by catalog browsing at The Illusions Index.
Geometric / Context Type 1
Müller-Lyer
Identical line segments appear different lengths due to arrowhead context.
Explore → Geometric / Context Type 1
Ebbinghaus Circles
A central circle looks larger or smaller depending on surrounding circles.
Explore → Geometric / Context Type 1
Café Wall
Parallel horizontal lines appear tilted due to offset mortar joints.
Explore → Geometric / Context Type 1
Hermann Grid
Ghost dots appear at grid intersections in peripheral vision.
Explore → Geometric / Context Type 1
Zöllner Illusion
Parallel lines look slanted when crossed by short diagonal hatch marks.
Explore → Geometric / Context Type 1
Ponzo Illusion
Identical bars look different sizes inside converging railroad tracks.
Explore → Geometric / Context Type 1
Delboeuf Illusion
Identical inner circles appear different sizes inside different outer rings.
Explore → Geometric / Context Type 1
Poggendorff Illusion
A diagonal line appears misaligned when interrupted by a vertical bar.
Explore → Geometric / Context Type 1
Vertical-Horizontal
A vertical line looks longer than an equal horizontal line.
Explore → Color / Contrast Type 1
White's Illusion
Identical gray bars look different on black vs white stripe backgrounds.
Explore → Color / Contrast Type 1
Simultaneous Contrast
Identical color patches look different on contrasting backgrounds.
Explore → Color / Contrast Type 1
Color Spheres
Gray circles appear red, blue, and green due to chromatic assimilation.
Explore → Hidden Figures Type 3
Rubin's Vase
See a vase or two faces in profile — one image, two readings.
Explore → Hidden Figures Type 3
Duck-Rabbit
One drawing reads as a duck or a rabbit depending on grouping.
Explore → Hidden Figures Type 3
My Wife and My Mother-in-Law
Classic bistable portrait with shared contour lines.
Explore → Hidden Figures Type 3
Tiger in the Bamboo
A camouflaged forest scene hiding a complete tiger in its vertical lines.
Explore → Hidden Figures Type 3
Faces in the Tree
Look at branches and roots to find five hidden human profiles.
Explore → Hidden Figures Type 3
Camouflaged Dalmatian
A sniffing Dalmatian dog emerges from a field of high-contrast black spots.
Explore → Hidden Figures Type 3
Hidden Arrow
Spot the arrow shape hidden in the negative space of a geometric pattern.
Explore → Hidden Figures Type 3
Hidden Face in Pattern
A human face is hidden in the lines and textures of a natural pattern.
Explore → Ambiguous Figures Type 3
Spinning Dancer
Silhouette appears to spin clockwise or counter-clockwise.
Explore → Impossible Objects Type 1
Penrose Triangle
An impossible triangle that cannot exist in three dimensions.
Explore → Impossible Objects Type 1
Penrose Stairs
A staircase that endlessly ascends yet returns to its start.
Explore → Impossible Objects Type 1
Impossible Trident
Three prongs become two cylinders — a figure-ground paradox.
Explore → Peripheral Motion Type 4
Rotating Snakes
Static rings appear to spin — zero animation in the code.
Explore → Peripheral Motion Type 4
Breathing Square
A rotating square behind occluders appears to expand and contract.
Explore → Peripheral Motion Type 4
Pinna-Brelstaff
Concentric rings appear to rotate when you move your head.
Explore → Peripheral Motion Type 4
Pulsing Grid
A high-contrast grid where intersections appear to breathe and pulse continuously.
Explore → Peripheral Motion Type 4
Moving Circles
Concentric gears that seem to rotate slowly in your peripheral vision as you look around.
Explore → Neural Adaptation Type 2
Complementary Afterimage
Stare at a colored cross; afterimage appears in your eyes only.
Explore → Neural Adaptation Type 2
Troxler Fading
Peripheral dots fade during steady fixation — a neural adaptation effect.
Explore → Cognitive / Gestalt Type 1
Kanizsa Triangle
Pac-Man shapes suggest a white triangle that is not drawn.
Explore → Cognitive / Gestalt Type 1
Curvature Blindness
Angled line segments hide smooth curvature until revealed.
Explore → Cognitive / Gestalt Type 1
Reverse Spoke
Wheel spokes appear to rotate opposite to actual motion.
Explore → Cognitive / Gestalt Type 1
Wertheimer-Koffka Ring
Ring segments look different shades due to surrounding context.
Explore → Cognitive / Gestalt Type 1
Fraser Spiral
Concentric circles appear as a spiral due to tilted segments.
Explore → Cognitive / Gestalt Type 3
Coffer Illusion
Grid of circles hides a pattern of rectangular coffers.
Explore →No illusions match your filters.