A mirror and a lens mounted on top project a live image of the outside view into a darkened room.

Jane Wolff's writings guide visitors on a walk along San Francisco's waterfront.

The colors you see here are all in your head.

What happens when you double the size of a chair?

When your eyes adapt to color, you can see things that aren’t really there.

Guess which photos are the human embryo, egg, and sperm.

Make your partner's face disappear, leaving only a smile.