What is it about a nook that draws us in? The informality? The coziness? Architects often carve nooks out of wasted space—beneath a staircase, under the eaves, by a window, or up in the air. Generally designed for a specific purpose, nooks compel us to curl up with a good book, take a long nap, eat a delicious meal, or to get to work. What do you want yours to do? Get a few ideas from the noteworthy nooks collected here.