Okay, WHAT????
Besides the MIT like explanation. Comparing scissors to the movement of the human body is a poor comparison indeed(one joint compared to many) and a linear 2 dimension movement to spherical 3 dimensional movement for starters. Last time I checked linear and spherical were two distinct concepts, granted they can be combined when talking about a three dimensional being such as ourselves, but good luck trying to get people to follow that one. I think I went blind in my left eye trying to reread that .