Up and Down is an educational short film directed produced by Pixar for Sesame Street featuring the character of Luxo, Jr., originally from the short film Luxo, Jr.. Directed by John Lasseter, the short built upon the original film, focusing on little Luxo discovering the concept of "Up" and "Down" with the help of his dad, Luxo, Sr. The short was included on the Pixar Short Films Collection DVD and Blu-ray. In the short, Luxo Jr. demonstrates "up" and "down" by jumping on and off of a cardboard box until he falls through. Source: pixar.fandom.com/wiki/Up_and_Down