The beauty of the design is that there's no one way to use the space; the architects let the children determine how to use the different elements of the room. Though the desk is often used for tea parties and drawing, it can also become a handy hiding place from parents or a nosy toddler brother. "It's a house in the house," says Santiard. "What's better than hiding under a table to play?"  Photo 7 of 11 in Kids' Room Renovation