In shots of the front of Edie's house (and other houses thru the series), you can see some of the window panes have a large circular "bubble" shape in the center of the pane. Even the episode when Foggy visits his girlfriend in Wales, in the shot of the front of the house, I've counted about 6 different window panes with this bubble feature. I was watching that episode yesterday, and was just curious if someone could tell if they were just fashionable for a time, or if they had a function. Thanks.