Even though I love today's 3D animation movies made with CG, there's something about seeing old fashioned hand-drawn animation that makes me feel like I'm peering into another world of breathtakingly fluid characters dancing on paper. Former Disney animator Glen Keane was a master at such animation and is responsible for creating characters we adore like Ariel, Aladdin, Beast and more. Watch his latest animation, Duet, which debuted at Google I/O, below.