Every Thursday from 6:00–10:00 p.m., After Dark transforms the Exploratorium into an adult playground with 700+ interactive ...

Up close, Posavec’s artwork is a colorful collection of symbols: cyan clouds, magenta lips, yellow suns, black cats, and more. From afar, the experience is very different—walk back a ways and you’ll ...

The Drawing Board is a pendulum that draws a unique design.

Use your voice to make visible patterns in sand. Sand scattered on a large metal square vibrates and jumps in response to the sound of your voice. When you hit just the right note(s), the sand ...

The digits of pi go on forever, without ever falling into a repeating pattern. Therefore any sequence of numbers you can think of—your ZIP code, your birthday, your phone number—are bound to appear in ...

Take off and fly in a mirror that makes half your body look whole. Here’s an exhibit where watching is at least half the fun. Positioned at one end of this large flat mirror, you can create any number ...

A stop-motion animation is made of many pictures, each slightly different from the last.

Your sense of touch can surprise you. A surprising—and as yet unexplained—tactile illusion can occur when you slowly rub your palms across this mesh. You may feel a strange, slippery sensation, as if ...

Toss some chips to estimate pi. Using a calculator at the exhibit you can divide the number chips by the number of crossings. The more chips you throw the closer this ratio gets to pi. This surprising ...

This 3D animation of microscope images shows how cells move.

Turbulent Orb is a half-meter diameter sphere full of special, colored, flow-visualization fluid. The sphere is mounted on top of a pedestal, it spins on a good bearing. Visitors grasp a metal ring on ...

Gas Model is a transparent plastic cylinder with bouncing balls activated by a vibrating plate. The moving balls lift a disk to a height which depends on the amount of energy introduced by the ...