Has anyone heard of the aura mill? I think I read about it in a book of parlour tricks and experiments years ago. Recently a friend of mine has really refined this device. He cuts a circle out of cooking foil, then scores the radial lines with a pointed object without cutting through the foil which now becomes an 'umbrella' shape , however before mounting the device on a needle point he takes a tiny piece of plastic, cuts a circular recess with the point of penknife blade into it then glues the plastic onto the umbrella underneath. The point being that this acts as an almost frictionless bearing that the needle point can rest in. To demonstrate its operation he curls his hand around the umbrella as if keeping the wind off a lighted candle. In no time the thing is merrily whirling round! He maintains that the gadget detects the human aura, explained by him as em radiation passing down to the fingertips. Sometimes the wind mill will rotate in the other direction, such as when you change hands and so sides. He also maintains that someone he knows can change the direction at will when asked! Now that would be interesting...but I have yet to see this. My question is where did this gadget originate from and has anyone else tried this 'trick'. Also, what makes it rotate, in your opinion?