Müller-Lyer Illusion
Which horizontal line is longer?
Perception · gallery
Visual Illusions
Your brain does surprising things to build the visual world you see. Each of these illusions takes advantage of a shortcut your visual system uses. Tap the reveal button on each one to see what is really there.
Café Wall Illusion
Are the gray horizontal lines parallel or slanted?
Hering Illusion
Are the two red lines straight or curved?
Ebbinghaus Illusion
Which orange circle is bigger?
Simultaneous Contrast
Is the small inner square the same gray on both sides?
Vertical–Horizontal Illusion
Which line is longer, the vertical or the horizontal?