A couple of things I noticed. I'd forgotten all the fruit vendors at the corners, ready to sell you a banana or a dozen pears or a pineapple. You don't see that in SF--it's either Safeway or the Farmer's Market (Farmer's Market produce is undoubtedly better than the stuff sold on street corners, but the on-your-way-to-work convenience of grabbing an apple or banana is a very mass-transit-and-walking-culter sort of thing. Musicians in the subway; BART doesn't have 'em. Sometimes in the halls of the underground, yes. But the wonderful flautist who came on at 79th Street and played Mozart to 66th Street does not have an opposite number in BART. Finally: every subway car I was in today had ads for English language tutoring. "Aprende Ingles Ahora!" Oddly, despite the huge immigrant population in San Francisco, I can't remember the last ad I saw for English language tutoring. Not to say it's out there, but it's certainly not a saturation ad. I'm still thinking about all this, trying to figure what it all means.