More Chicago architecture from the Near North Side. I don't know what Mark and Marilyn talked about during the times when I fell back, taking loads of photographs while they walked blithely on ahead, but I remember several times when Mark and I discussed architecture in general and certain details in particular. He mentioned that Frank Lloyd Wright was fond of Roman brick "Those are the thin ones," he said, and Wright used them in his Prairie Style homes. You know how sometimes someone says something and you don't get it? Mark kept talking about that thin Roman brick, pointing out different examples to me. I must have looked quite blank, because every building we saw with Roman brick, he would look at me rather quizzically and say, "There's another one with that thin brick." Finally I said, "Mark, how do you know how thick the bricks are just by looking at the front of the building?" He looked at me. I looked at him. Nobody said anything. All of a sudden it dawned on me what he'd been saying! Here I am thinking he's telling me the bricks are really thin, like a veneer. He's actually telling me they're not very tall. They're long and thin, as opposed to being short and squat. This has nothing to do with their depth. Isn't it astonishing? We both speak English as our first language, and still ... the meaning of that one little word was totally lost. I hope you will pay particular attention to the brick on this building, especially the bit above the first floor where the bricks are really thin. That's Roman brick, and it was a favorite of Frank Lloyd Wright.