As online learning extends its reach, though, it is starting to run into a major obstacle: There are undeniable advantages, as traditional colleges have long known, to learning in a shared physical space. Recognizing this, some online programs are gradually incorporating elements of the old-school, brick-and-mortar model—just as online retailers such as Bonobos and Warby Parker use relatively small physical outlets to spark sales on their websites and increase customer loyalty. Perhaps the future of higher education sits somewhere between the physical and the digital.