Mickey Mouse’s runaway horse gallops toward the camera in The Plowboy. The animator uses a cycle of 32 drawings, one per frame. Here are some of them. I guess this was as close as you could get to 3-D in 1929. I imagine it still looks pretty effective on the big screen. (Oops! The horse’s bottom teeth lose their whiteness for a frame).
Here’s the cycle slowed down.
Hans Perk has posted the story drawings for this cartoon. See them at his excellent site.