Where is A113 hidden and what does it mean?

Disney, Pixar, The Simpsons and many other famous animations have hidden this number over the years:

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A113 simply refers to the classroom number where many animators learned their craft, a classroom number at the California Institute of Arts. This room was used for first year graphic design and character animation, where many of the animators at Pixar and Disney (and other studios). “A113” gives a nod to the other people doing what they do and that’s awesome.

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