What is a133 from Disney?

A133, often referred to as "A113," is an inside joke and recurring Easter egg in many Disney and Pixar films. It refers to a classroom number at the California Institute of the Arts, where many animators and filmmakers studied. The number has appeared in various forms throughout animated films, serving as a nod to the animation community and its roots. Fans often enjoy spotting it in different movies as a fun reference to the industry.