Interactive Optical Illusions

	Cafe Wall This now famous optical illusion was first observed in the tiles of the wall of a café.

	Wine Glass Illusion Find a way to completely remove one of the glasses from the tray.

	Straight Lines Illusion The Hering Illusion is an optical illusion discovered by the German physiologist Ewald Hering in 1861. The two vertical lines are both straight, but they look as if they were bowing outwards.

	Bigger Arc Illusion The bigger the better. Which arc is bigger? The Jastrow Illusion is an optical illusion discovered by the American psychologist Joseph Jastrow in 1889. In this illustration, the two figures are identical, although the lower one appears to be larger.

	3D Discs French artist Marcel Duchamp created these Rotoreliefs, discs designed to be placed on the turntable of a gramophone.

	Longer Line Illusion The Müller-Lyer Illusion is an optical illusion consisting of nothing more than an arrow.

	Taller Line Illusion This is one of many versions of the Ponzo Illusion, an optical illusion that was first demonstrated by the Italian psychologist Mario Ponzo.

	Taller Trumpeter Illusion This is another version of the Ponzo Illusion, an optical illusion that was first demonstrated by the Italian psychologist Mario Ponzo.

	Dance Wheel The phenakistoscope (also spelled phenakistiscope) was an early animation device used to create the illusion of motion.

	Top Hat Illusion The top hat illusion is a variation of the T-Illusion.

	Square Circle Illusion The Ehrenstein Illusion is an optical illusion studied by the German psychologist Walter Ehrenstein in which the sides of a square placed inside a pattern of concentric circles take an apparent curved shape.

	Impossible Stairs Illusion If going up stairs. These stairs will tire you out. The Penrose Stairs is an impossible object created by Lionel Penrose and his son Roger Penrose.

	Rabbit Duck Illusion Get your ducks in a row!

	More Lines Illusion The Zöllner Illusion is a classic optical illusion named after its discoverer, German astrophysicist Johann Karl Friedrich Zöllner.

	Vanishing Leprechaun Have you ever seen a leprechaun? They're hard to spot.

	Optical ABC's Illusion Do you know your ABC's?

	Stairs Illusion Proof that up is down and down is up.

	Elevator Illusion Still further proof that up is down and down is up.

	Pac-Man Illusion Blast from the past? This optical illusion known as the Kanizsa Triangle was first described by the Italian psychologist Gaetano Kanizsa.

	Flower Power The Ebbinghaus Illusion is an optical illusion of relative size perception.

	Necker Cube The Necker Cube is named after the Swiss crystallographer Louis Albert Necker

	RR Tracks Illusion Wrong side of the tracks. The Ponzo Illusion is an optical illusion that was first demonstrated by the Italian psychologist Mario Ponzo.

	Perfect Squares Illusion The perfect illusion? No, the perfect squares illusion.

	Which Connects? Which line connects? The Poggendorff Illusion is an optical illusion that involves the brain's perception of the interaction between diagonal lines and horizontal and vertical edges. It is named after Poggendorff, who discovered it.

	Twin Tables Illusion Which table is bigger? Would you bet your money on it?

	Growing Bunny Illusion Watch the bunny grow right before your very eyes.

	Colorful Carrots Illusion There's more to this optical illusion than meets the eyes.

	Ball & Shadow Illusion Is there any ambiguity in the path of the moving ball? Only the shadow knows.

	Buldge Illusion Do you see a bulge? This is a variant of the Hering illusion, from Akiyoshi Kitaoka.

	Liar Liar, liar, pants on fire!

	Leaning Tower Illusion This illusion is best described as an visual rather than optical because the "trick" happens in the mind not the eyes.

	Friendly Triplets or Twin Pirates? You decide if the three men are friends or foes.

	Illusion of Motion And finally, our tribute to world's most popular optical illusion!