The half room is full of half things: A half chair, a half cat, even half shoes—all just as nice as whole things. When half a knock comes on half a door, who in the world could it be? With inventive flair, Caldecott Honor winner Carson Ellis explores halves and wholes in an ingenious and thought-provoking picture book for readers 4 to 7. Paying homage to Goodnight Moon, the text is simple yet dreamlike, while the ink and gouache illustrations feature clever details and velvety textures that leave space for imagining.