vintagemickeymouse:

“The multi-plane camera had levels and on each of these levels we put a big glass on it. We’d paint the foreground trees on the top one, the background, the house that you’re photographing, the characters come out and on the fourth level would be the sun and the sky. When the camera panned down through these levels, you got a third dimension effect.”

– Bob Broughton, Camera Effects Artist for Walt Disney Productions