Marthe Jocelyn is back with another clever concept book to follow Hannah's Collections , Ones and Twos and Where Do You Look? This time, she tackles counting and categories. Sam's things are in a heap. Time to tidy up He starts to organize his things, but quickly runs into trouble. He can make a pile of black and white things. But the penguin also belongs in the things with wings pile. He can make a pile of rocks. But the round rock also belongs in...