Four mouse buses, ten watermelons, thirteen tractors, nineteen hungry pigs, fifty boats and ninety carrots are some of the things Willy Bunny counts, at his father's suggestion, on a day when there is no one to play with and nothing else to do. For what it's worth, Scarry pictures the objects in groups--er, sets, and he sneaks in some addition for those who will pick up on it (""Five fire engines and a fire chief's car. . . make six. . . . Three have ladders. Three do not. Five are red and one is white""), and of course all that stamped out repetition in the pictures can be counted on to occupy others as amenable to suggestion as Willy is.