For years,Cornell University's College of Architecture, Art and Planning in Ithaca, N.Y., was housed in four separate and distinct buildings. But rather than tear them down to build one large new building, the school opted to knit a few of them together. The result is a 47,000-sq-ft structure—fitted between Sibley and Rand halls like a jigsaw puzzle piece—that juxtaposes glass-and-steel against the older buildings' stone-and-brick facades.