Traditional offices are disappearing—some are being redesigned to be beautiful spaces that employees actually want to come to work in and meanwhile, humbler versions of the Silicon Valley spaces are increasingly popular too. This year, about 1 million people will work in a co-working space. In ten years, that number will top 1 billion. The co-working idea reflects the trend that companies keep trying to move more of their balance sheet from fixed to variable costs, and the supply of office-less workers keeps rising. So which vision of the future will win out—the palace or the co-working hive?