This is the reason I had that polarization filter on. The brewery had a display of a number of beer glasses from different parts of Belgium. In Belgium, it is very important that you drink a beer with the proper glass. Each glass is designed for a particular beer, and is supposed to enhance the flavor (I have no idea if this is true or not). The polarization filter allowed me to shoot this picture with a flash even though the glasses were behind glass. I think it looks pretty good.