Laps

When I bring up a lap, I am not referring to one time around the track, or one trip down the pool. I am actually talking about that disappearing entity known as your "lap." What is a lap really, and furthermore, does a lap exist? A lap is only present when one is sitting and the waist is bended, most likely the person is creating a 90 degree angle between their torso and the thighs. In this instance, the lap is usable for another person to sit on, dance on (if you are into that), or to merely rest your hands or a magazine. The issue of the laps validity as a thing is questioned when the person stands. At this 180 degree angle of the body, there is no existence of a lap. Where did it go? One might argue that the lap still exists, it is just not useful while standing, but I think it may be the most brilliant trick a person can play. Can't you just see a magician threatening to make a person in the audience's lap to disappear, and then just asking them to simply stand up?BRILLIANT!