When my sister, Caitlin, was in town in early January, we went to the New York Transit Museum with her boyfriend, Nolan. (The museum itself is pretty interesting, but if you go too close to closing be careful not to get suckered into wasting all your time on the Triborough Bridge exhibit. It is surprisingly thorough…and just not worth it.) On our way out, I recorded the sound of a few old turnstyles, which made some great mechanical ratcheting noises.