The highlight of my recent trip to New York for Thanksgiving was a chance to get into Manhattan and finally checkout MoMath with my sons. I really wish we had something comparable here in Seattle. The exhibits were all very interactive and well suited to grade school kids. Not surprisingly, given its visual nature there was a heavy focus on geometry.
Robot swarm that followed the kids based on the color of the vest they wore. The algorithm was programmable from a station.
Life-size hinged polygon. Now I'm a square, now I'm a triangle.,
Harmony of the spheres.
Lifesize rotating maze.In this one you had to cross a red line, blue line and then a white one. (This was one of the few activities I could actually replicate using painter's tape.)
Interactive multiplication parabola sculpture. You chose the 2 numbers to multiply and the connection lit up.
Painting with symmetry.
Position/elocity interactive game. The kids ran back and forth to make it through a series of gates on the screen.
Galileo's curve. This was adjustable and you timed the cart going down the track.
Doorway with the obligatory pi handles.