Light and Heavy 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.. Co-directed by Lasseter and Andrew Stanton, the short built upon the original film, focusing on little Luxo discovering and showcasing a "light" and "heavy" 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. and his father demonstrate heavy and light with the use of a beach ball and a bowling ball. Source: pixar.fandom.com/wiki/Light_and_Heavy