The ‘Undone’ director combines rotoscope and hand-drawn animation, live-action performance, and oil-painted backgrounds to capture the subtle intricacies of human emotions within a dream-like, 'unreal' aesthetic; watch the animatic of his upcoming short, ‘Resurrection,’ to be released in 2025.
Pixar s Web site provides an interesting history of the company (albeit in bits and pieces). Their first production in 1986 was an animated short title.