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balls. If you've ever seen a ball suddenly move what appears to be erratically where it'll suddenly go up or it'll suddenly kick left or right. Usually what's happening in that case is again, the ball will have a spin to it which exerts an inertial force. What you're having is a it's encountering wind or density changes very quick. So it moves from the laminar flow dynamics of that boundary layer change very rapidly and then what you'll have is you'll basically have a pressure gradient develop either above, below, beside, wherever in one of those three dimensions and that's why suddenly as the flow changes the ball will behave erratically. And again, it's more dramatic if you're sort of looking behind the ball or towards the ball that's theoretically coming straight towards you. That's when you see the deviation. It can be very