I have known this animation for a few years, and remembered about it yesterday for some reason. It was made by Erick Oh, and is hand drawn.
About Erick Oh (from his website):
ERICK SOOHYUNG OH (오수형)
Erick Oh is an award winning animation artist based in Los Angeles. His work has been introduced and nominated at Annecy, Siggraph, Anima Mundi, Ars Electronica, Student Academy Awards, LACMA Director’s Night, and numerous other film festivals. He spent most of his life in Korea where he started producing a variety of work, in which the boundaries were blurred between media and contents. Even though it is in animation where Erick feels most comfortable as his main tool to communicate and interact with the viewer, he would not consider himself only as a film maker but as an artist who continues trying to expand the definition of animation and art. By building on his fine art background established in Seoul National University, Korea where he achieved his BFA degree, he continues his in-depth study in animation. He is currently enrolled at UCLA’s MFA graduate film program.