the only levitation for that spot is... well, I can't tell you know, I will tell you next monday at 12pm eastern.... and yes, I know that joke is played out but I had to say it.
Seriously, once you have 50 people I would go into things you know very very well. I also agree that a simple rubber band flotation would be great. Don't forget, just because you think it is simple, it does not mean that lay people will not find it amazing.