As much as I've seen the reference and seen matched played indoors on carpet on television, I've never seen it in person. So, what exactly is it? Is it literally like very short utility carpet (like that green stuff on artificial putting greens or patios, or the stuff found in people's garages), or is it something else? I once went to a tennis clinic held in a high school gym. They rolled out what was basically a rubber mat to pay on. Was that "carpet" by tennis standards?