LOOK • TEST • DISCOVER

Afterimage Flash

Stare at a colored shape, then shift your gaze and see its ghostly opposite.

Age 8+3 minColor Illusion

Try it first. Read the explanation afterward.

WHAT'S HAPPENING?

There is a reason.

Light-sensitive cells adapt to a strong color, so a complementary color can appear afterward.

These activities are designed to stay simple, safe and easy to repeat.