“The span of twelve years between ‘Steamboat Willie’, the first Mickey with sound, and ‘Fantasia’, is the bridge between primitive and modern animated pictures. No genius built this bridge. It was built by hard work and enthusiasm, integrity of purpose, a devotion to our medium, confidence in its future, and, above all, by a steady day-by-day growth in which we all simply studied our trade and learned.”

Walt Disney remembers his studio’s “Growing Pains”