So you need to do some set up prior so not totally impromptu unless you preset and have some of
these always ready to go in a briefcase or something. Good video, great idea's on the presentation,
people are amazed by it. Video drags in the middle a bit when they go into history and explaining
how they come up with ideas etc. but you should watch all the way through to see how the set up is
done on the fly etc. I like this trick, buy it.