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 ...

Sunlight–reflected and refracted–paints an ever-changing color composition. Created by artist Bob Miller, this classic Exploratorium exhibit is a “live” painting that uses light from the Sun as its ...

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 ...

It takes just 21 days for an egg to go from just laid to newly hatched chick, and a lot goes on in just the first week. Look closely and you’ll find blood vessels, a backbone, wing buds, eyes, a brain ...

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 ...

With a mere touch from your fingertip, you can create waves in the chain that move in decidedly strange ways, warping as they wander. The apparent strangeness is a result of relative motion. Waves ...

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

A strip of 64 computer-controlled LEDs flashes on and off extremely rapidly. When you look in the mirror and quickly move it from side to side—or sweep your eyes sideways—the changing pattern of light ...