Walt Disney on how to train and what it means to be an animator:

The first duty of the cartoon is not to picture or duplicate real action or things as they actually happen - but to give a caricature of life and action - to picture on the screen things that have run thru the imagination of the audience to bring to life dream fantasies and imaginative fancies that we have all thought of during our lives or have had pictured to us in various forms during our lives.

This comes from an eight-page memo that Disney wrote in 1935, a year after Disney had begun production on Snow White, and two years before it was released.