Talk About Renting a Hole in the Wall - New York Times

So you think your place is small? One night recently, a group of architecture students staying up late in a loft in Brooklyn took to amusing themselves by stuffing a mattress into a hole cut into the wall above a bedroom door. Then they tried the mattress out for comfort. Not half bad! It occurred to one of them, Nick Freeman, that people might pay money to call that elevated mattress home.