Light & Heavy is a Pixar computer animated short created by Pixar Animation Studios for Sesame Street in 1991. It starred Luxo Jr. from a previous Pixar film.
In 1997, it was shown on a short film of Odyssey's Computer Animation Showcase.
The two balls in this segment are different. One is a colorful beach ball described as "light" and another is a green bowling ball described as "heavy".
Luxo Jr. likes playing ball, so after entering the screen, he kicks the beach ball with his head passing it to his dad, Luxo Sr, who passes it back to Luxo Jr. He tries to push his new bowling ball with his super strength, but it's not working, so he kicks the beach ball higher and pushes the bowling ball with much effort while it pushes Luxo Sr. away from the screen.