Joel Arbaje 12.29.11 3:30 AM A couple who upgraded to a nearby apartment after having twins return to Wuwucun, China for a visit. The village homes are tiny—about 270 square feet—and typically house four people. Photo by Mark Leong See more of the best photos of 2011 We’re giving away 5 tickets to the Innovation Festival! Enter below. I’ll also get special updates regarding the Innovation Festival Send I'd also like to receive the Fast Company Daily newsletter.