There is a small code hidden in some of the most beloved movies ever made, and most people watch right past it. It reads A113, sometimes written with a dash as A1 13. You can find it on a license plate, a door, a camera, a courtroom number, or a stray piece of paper in the background. It hides in Pixar films, Disney films, cartoons, and even a few live action blockbusters. Once someone points it out, you cannot stop noticing it. So what is A113, and why does it keep showing up?
The answer goes back to a school. A113 is the number of a classroom at the California Institute of the Arts, known as CalArts, in Southern California. That specific room was home to the first year graphic design and character animation students. Some of the most important animators of the last few decades sat in that room as young artists. When they went on to make films, they started slipping the number into their work as a private wink. It became a signature, a way of saying that this room helped make me.
The list of people who passed through that program reads like a hall of fame. Brad Bird, who directed The Incredibles and Ratatouille, studied there. So did John Lasseter, Pete Docter, and Andrew Stanton, names behind Toy Story, Up, and Finding Nemo. Tim Burton spent time at CalArts as well. These artists scattered across studios, but they carried the same inside joke with them. That is why the code jumps from one studio to another instead of staying in one place.
The appearances are everywhere once you look. In the very first Toy Story, the family car carries the license plate A113. In Finding Nemo, the camera that a diver drops carries the code. It shows up in A Bug's Life, in WALL E, in Cars, in Brave, in Toy Story 3, and in Inside Out. The animators tuck it into a sign, a model number, or a room number where it blends into the scene. You have almost certainly looked straight at it without registering a thing.
It did not stay locked inside Pixar either. Disney animation adopted the same habit, since artists moved between the studios and shared the tradition. You can spot A113 in The Princess and the Frog, in Meet the Robinsons, in Big Hero 6, and in Zootopia. The tribute crossed the hallway between studios as easily as the artists did. The joke belongs to the whole animation community, not to one company. That is part of why it has lasted so long.
Television and other films got in on it too. Brad Bird directed early episodes of The Simpsons, and the code turns up in that show more than once. It appears in The Iron Giant, another Bird film, and in the animated series American Dad. It has even been spotted in live action movies, including a reference in a Marvel film where a scene calls out A113. At this point the hidden number has traveled far beyond the school that started it. It has become a shared handshake among storytellers.
Brad Bird has spoken openly about what the number means, so this is not a wild fan theory. He has described A113 as a nod to the classroom that shaped him and many of his peers. That confirmation is part of why the tradition keeps going, since new animators know exactly what they are honoring. Hiding it is a way to thank the teachers and the room without stopping the story to do it. It is a tribute that respects the audience, because you do not need to catch it to enjoy the movie. If you do catch it, you get a little bonus.
That is the real charm of A113. It rewards the people who pay attention without punishing the people who do not. It links a courtroom in one film to a license plate in another across decades of work. A single classroom full of art students left a fingerprint on a huge slice of modern film. The next time you watch an animated movie, keep half an eye on the signs and plates in the background. There is a fair chance those three characters are hiding in plain sight. And now you will never unsee them.
