There was a door in the wall that was just big enough to fit someone very small. When he felt sad, he liked to climb into the unfinished niche and shut the door behind him. He would sit and suck on his thumb and rock back and forth as much as the small space would allow. Occasionally, when he would turn the knob to try to leave, it would stick stubbornly and he would fear that he might be trapped. But it always opened, and it was never enough to keep him from coming back.