Subject: Perception

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

Strange things can happen when your brain gets confused.

It’s all in the way you look at it.

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.

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