Müller-Lyer Illusion
Which horizontal line is longer?
Perception · gallery
Visual Illusions
Your brain is doing wild things to construct your visual world. Each of these illusions exploits a shortcut your visual system takes. Tap the "reveal" button on each to see what's 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?