One of our two cats has learned the art of levitation. This means that if there's a barrier (oh, say, put up by my wife to keep certain four-legged mammals out of the quilt room while she works in there), he literally zooms up in a completely lateral form, moves horizontally over the barrier, then vertically downwards, without changing shape or vector. I suspect helicopters were designed after someone saw a cat do this.
[ 02-14-2002: Message edited by: fable ]