The Hoberman Minisphere is a wonderful toy that you can take with you to work, school, in the car, or wherever. It's more portable than the larger versions and sturdier than the Microsphere. Just pull on opposite ends and it expands from 5 inches to 12 inches. This is popular among teachers, children, as a desk toy, and even in some forms of physical therapy. It comes in bright colors which are separated into rings which form the sphere. For ages 4 and up.