Every time I try to explain Layer Tennis to someone in person, they look at me like I’m crazy, so let’s see if this makes sense: Chicago design house Coudal Partners is hosting this online sport where two designers trade Photoshop files back and forth in 15 minute “volleys” with commentary by a blogger. It all unfolds in real time on Friday afternoons in front of a live audience chattering away in forums. This afternoon’s match features Chicago’s own Chuck Anderson vs Steven Harrington and next week has Gapers Block (etc.)’s Naz Hamid vs Chris Glass.