I want to finish off this series on long-exposure photography with a post about light painting. It's got nothing to do with history, but I think it's really cool: how else can you draw in 3D?
Pablo Picasso did a series of light painting for Life magazine in 1950: if the gallery below doesn't work, then you can read the original article here.
Some other nice examples:
Click on the pictures to receive full attribution and copyright info