you are going to need:
Sheets of "Fun Foam"
a Styrofoam ball (Ours was about 9 inches in diameter)
thick paper plates
an LED push-button light
a spinning stool-chair-thing
determine the size of your Styrofoam ball. you need to measure the circumference and diameter.
Make sure you have enough "Fun Foam" to fill the dimensions of [Circumference x diameter]