Project Ara seems like the sort of thing that could never in a zillion years work, but Google is committed to giving it a shot. After bringing Motorola's ATAP in-house, the company has forged ahead on Project Ara. Now project head Paul Eremenko has offered up a few new details of how Ara will work. Basically, the phone can be taken apart while it's on.
The idea behind Ara is that you'll add the modules you want to the device based on your needs.
Project Ara Will Run A Modified Version Of Android L That Supports Hot-Swapping All Modules Except For CPU And Screen was written by the awesome team at Android Police.