A fascinating exhibit of both solar energy and light refraction, this see-through device sticks onto any sunny window to create a never-ending display of scientific beauty. Watch the tiny solar-powered motor spin as twin Swarovski crystals split sunlight into its component colors and send rainbows cascading across walls.

• 1 3/4''W x 7''H X 2 1/4''D.
• Ages 8 and up