The muse gets all the press, but here’s a fact: Good writing involves obsessing over punctuation marks. It’s 1 a.m., you’ve got a 5,000-word piece due the next day, and for the last twenty minutes you’ve been deliberating about the use of a semicolon versus a period in a single sentence. (But should it be two sentences? Twenty-five minutes, thirty minutes … ) As a rule, the effect of all that obsession is subtle, a kind of pixel-by-pixel accretion of style. Once in a while, though, a bit of punctuation pops its head up over the prose, and over the prosaic, and becomes a part of a tiny but interesting canon: famous punctuation marks in literature.