Interactive Optical Illusions

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

	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.

	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.

	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.

	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?

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

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

	Cat & Mouse Cat and mouse is an English-language idiom dating back to 1675 that means "a contrived action involving constant pursuit, near captures, and repeated escapes." - Merriam-Webster Online Dictionary

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