What are Wine legs?

The rivulets of wine that roll down the inside of the glass after a wine has been swirled are called legs in America and in Britain. The Spanish call them tears; the Germans, church windows. Some wine drinkers look for great legs, falsely believing that nicely shaped legs (and who knows what that means?) portend great flavor. In fact, legs are a complex phenomenon related to the rate at which liquids evaporate and the differences in surface tension between water and the wine’s alcohol content. Legs have nothing to do with the quality of a wine.