A baby lamp finds a ball to play with and it's all fun and games until the ball bursts. Just when the elder Luxo thinks his kid will settle down for a bit, Luxo Jr. finds another ball—ten times larger.
"Luxo Jr." has a great parent in the larger lamp. Even though Jr. is a bit unpredictable, the elder Luxo gives him room to grow and explore. And the tiny light has no problem with that.
When John Lasseter was learning how to make models, he chose the nearest, easiest subject: an architect's lamp sitting on his desk. He started moving it around in the animation system like it was alive, and it eventually became a Pixar short that was nominated for an Academy Award?.