A cage ball is a large, inflated ball, used in many American elementary schools physical education programs. Cage balls typically have a diameter of 48" or 60", though 72" diameter models are available, commercially. The inventor of the cage ball is Doctor Emmett Dunn Angell.
Physical education teachers will make many uses of cage balls, but perhaps the most common use is to employ it in a pseudo-soccer game. Because of its size, the ball is virtually impossible to dribble downfield, and students simply push against it with their bodies, often with several children climbing on the ball at once. As normally inflated, the ball yields easily to pressure. Some teachers use a rule under which children are permitted only to use their legs and not kick the ball. Cage balls are also used in "cooperative games". Mainly used to play Crab Soccer in American schools.
Cage balls have an internal rubber bladder to contain the air. The outside is sometimes vinyl, though for many years the covering was only made of canvas. Although spherical (when not being pushed), the cage ball shares the American football's "laces", which holds the bladder in.
Games
In addition to pseudo-soccer, there is also Omnikin, a Canadian game. Omnikin (also known as Kin-Ball) is a game among primarily three teams who work together to earn points by making the other teams drop the ball.