A more recent development is "lightning doodles" - it's sort of "air animation" or "air drawing". You open the shutter on a camera in a fairly dark space, draw in the air with lights, and close the shutter. Shoot a sequence of frames and you have animation. This movie is from the people who originated the technique:
The artists and animators at Quickdraw Animation Society (including me) haven't yet made a complete pikapika movie. We've done some testing to get the feel of the process and what it takes.
Pikapika has a lot in common with pixillation, and things in common with dance as well. The artists doing the doodles aren't creating images with their bodies, as dancers do, but using their bodies and motion memory to repeat actions in slowly varying positions and with the same timing from frame to frame. Time will tell if doodling in the air becomes a real genre, style, or technique (choose one) of its own.