Sorcerer's Apprentice

This is concept art for "The Sorcerer's Apprentice." According to the Disney Family Museum in San Francisco:

Earmarked from the beginning as something out of the ordinary, "The Sorcerer's Apprentice" was originally planned as a special Mickey Mouse short; a kind of culmination of Mickey's career to date, featuring the studio's best animators and an orchestral score conducted by Stokowski.... Eventually, this ambitious plan led to the still more ambitious "Fantasia." "The Sorcerer's Apprentice" was also intended as a showcase to introduce the newly redesigned Mickey Mouse to theater audiences -- but by the time "Fantasia" was completed and released, the "new" Mickey had already been in several short subjects.