I think this question is mostly for ![[livejournal.com profile]](https://www.dreamwidth.org/img/external/lj-userinfo.gif)
ilai. But it's a detail sort of thing.
Stand at the southeastern corner of Beacon St. and Somerville Ave., preferably after dark. Look at the signals on the commute rail; look at the traffic lights. Are they actually different colors? (And if so, why?)
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