Subject: Perception

A flash of light prints a lingering image in your eye.

Learn how to fly with this neat mirror trick.

Make yogurt from yogurt.

A rotating black-and-white disk produces the illusion of color.

Stare at one color—but see another.

To see or not to see.

Discover why the sky is blue and the sunset is red.

Give a light source the raspberry and watch it wiggle—but the only thing wiggling is you.

Make a truth teller for light.

Make a friend disappear, leaving only a smile behind.

Your brain combines information from your eyes in surprising ways.

"Cold" metal and "warm" wood may be the same temperature.

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