In a spare, drab office park in Sunnyvale, California, a bunch of two-by-fours and foamboard have been nailed together into a makeshift model of a shipping container. Inside, a bare, unlit Edison bulb hangs from a wire, over some simple IKEA furniture and a table with Lego blocks on it. The blocks are stand-ins for modules that might someday go into the Project Ara phone, which in theory will let users swap in different components on the fly instead of replacing the whole phone when its time to upgrade.