This was the 2009 Caldecott winner. My personal thoughts on its selection were simply that it was undeserving. The illustrations are black and white etchings/penmarks with random items colored in yellow. It is unusual, but not necessarily spectacular.
The story is rather vague and without any real purpose. There's an adult giving a child a key to a house, then describing the house with the light and a bed and a book and a bird and a song that is all about the dark, then the story reverses until it ends back with the house in the night and a home full of light.