PRODUCT DESCRIPTION A rainbow of primary colors effortlessly changes volume up to 30 times! Colorful linking rings provide hours of fun! Welcome to the wacky world of Chuck Hoberman! The Hoberman Sphere expands and contracts with a magical motion so fluid and simple that kids can't help but play with it for hours. A master of illusion, the Hoberman Sphere can be thrown, bounced, kicked, spun, rolled or suspended from the ceiling. The polymer links allow the sphere to change in volume 30 times and the rainbow of primary colors swirl as it is tossed and contorted. Includes an educational booklet about the Sphere, a "21 Cool Things To Do" activity sheet, a pulley, hardware and instructions for hanging as a cool kinetic energy mobile. Collect them all! For ages 4+. AMAZON.COM The Hoberman Sphere starts small and grows larger. And vice versa. Made of rainbow-colored plastic links, the sphere expands to 30 inches in diameter and contracts to a compact 9.5 inches. There's a hypnotic fascination in making the sphere expand and contract over and over again, but if kids want to do more with their sphere, a guide (included) lists some possibilities. How about trying the ballerina spin, the flip down, or the hot potato? The sphere can also be a fashion accessory. Think spiked hat or, even better, space helmet. Another option is to hang the sphere as a mobile. A pulley system is included, and a pull of the ring will cause the sphere to contract. Release the ring for expansion. Plenty of fun, the Hoberman Sphere might get kids thinking about mechanical engineering and some folding/unfolding projects of their own. Winner of the Parents' Choice Award. --Wendy Slotboom FROM THE MANUFACTURER The original Hoberman Sphere. Expands from 9.5" to 30"! See more