Downstairs at the Frost Library archives, you can find all the bound Olio yearbooks lined up just so. Browse through them in sequential order, and you fall into a kind of time-travel fugue state: two centuries of in-jokes, plus an unsettling montage of fashion and hair choices. Crew cuts in one decade give way to questionable moustaches in another, peacoats are trounced by fleece, clogs segue to Uggs, and it’s like waves of nostalgia keep breaking between two covers, as each class is caught from 1861 until today…