Photo of Disney Legend Ub Iwerks.
Here is the trailer of Leslie Iwerks documentary about Walt Disney Imagineering.
From Variety:
Disney plans to pull back the curtain on its Imagineers with a feature-length documentary that explores the history of the division behind the designs of its theme park rides and other attractions. Leslie Iwerks, the daughter of Don Iwerks, a former Disney animator and Imagineer, and granddaughter of Ub Iwerks, co-creator of Mickey Mouse and Oswald the Lucky Rabbit, is directing the project.