haha...see Ive learned alot from watching that stuff too.
but really have you ever seen a piece of metal that they shape for a tank?
its always curved and rounded in the same shape....the beat on the the middle to get the scooped out dome piece, and then it eventually curves around in the same manner to make the shape of the top of the tank.
have you ever seen them dome a piece of metal with the hammer and the make it curve in the opposite direction as the dome?
like when you take a piece of paper and slightly bend it away from you and then try to roll it up?...its like the one bend unbends the other bend..right?
