Resuming (and concluding!) my travel notes ... at my hotel, guests received three keys. One of them was a "key" in the old-fashioned sense, a metallic thing with a jagged edge meant to fit a particular lock. That was for the room's wetbar. The other two keys were "keys" in the new-fangled sense, magnetized cards. One of these was for the door to my room, the other allowed me to work the elevator. This was the first hotel I have ever been in at which I received such a key panoply. When my trip was done, I flew home. This was part of my design all along. The train one way, the plane the other. I had to make some sacrifices. A couple of the souvenir trinkets I had purchased in my wanderings around time and town were not, I decided, the sort of things with which one easily gets through airport security in this age, so I left them for some future inhabitant to room 910 to discover for himself in the drawer of the bedtable. But even having made those sacrif...