Sign spinning.  If you live in an area where the car is a popular mode of transportation then chances are you’ve seen a sign spinner.  If you don’t know, sign spinning is a new practice that consists of throwing around a piece of advertising in a way that is part street art, part break dance, part testosterone-fueled-version of synchronized gymnastics.   Some sign spinners are savants.  Some of them are just sad.  I believe, all of them earn a fairly low wage for spinning that sign.   Here’s a quickie vid to give you an idea of the sign spinning world if you don’t know about it:     I don’t know how I feel about the sign spinner.  On one level, I feel…