The National Film Board of Canada has a streamable collection of some of the works of famed Scots/Canadian animator Norman McLaren. Perhaps most fascinating--or at least most educational--are the five parts of Animated Motion, a series of educational films by McLaren and his often-collaborator Grant Munro. Part 1 is pretty elementary even for those with a passing interest in animation, but the animation principles revealed become more fascinating with each successive section of the course.