It’s not every day you get to see a cross section and floor plan of one of Yale’s secret societies. But both are on display for the society Manuscript’s building; they’re part of an exhibit at the School of Architecture on the work of architect King-Lui Wu, who taught at Yale for decades. He designed Manuscript’s building in 1961; if you check out the exhibit before March 23, you can get an idea what’s behind that enigmatic white brick façade.