lol fantastic (i know im a pupil but i dont care! great idea!!!) although i wouldnt trust my science class (TOP SET science class!!) with a piece of paper as they almost burned the science block down on monday!
I saw this done for one of the Royal Institute Christmas Lectures a few years ago. (yes I know watching them is sad, but I'm an engineer and hence trained and licensed to be a BOC)
It was a really effective and simple way to demonstrate a bit of a mind blowing subject.