Took a short break in the middle of that and hung out for a bit with spillourguts at the zebra lounge. Quite relaxing. The guy that seems to manage the place totally spotted me my tea without me saying a word. He just flatly turned away my $1.25. I guess that means I'm actually a regular or something.
I finally read through Pitts and Gabbay's paper abouth the calculus of names in terms of Frankel-Mostowski permutation models of set theory with atoms. It's terribly beautiful stuff, actually. I'm looking forward to the POP seminar talk this thursday, which is to be about a logic programming language based on it.