OK, today I had this brilliant oppourtunity to daydream. My Dad is the technician for a disco buissness, and he was doing a party for 8 year olds - I went with my parents to show the kids how to do some of the dances.

Anyway, we set the equipment up on a stage, but there were 2 curtains - one hiding the main stage area, then there was a black curtain about 21 feet behind it, and the distance between that and the wall was about 3 feet. That curtain stayed closed for the whole disco.…