. . . but ""if I put it on my head it is."" Likewise baby brother is not a chair but ""if I sit on him he is."" And Mother's purse is a toy if I play with it, because ""if I can sit on it, pound on it, ride on it, sleep in it, play with it, and put it on my head, then I can find out what it is by myself."" A book by Moffett and Perl is not the usual outsider's imitation of children at play; like the depicted toddlers they do something new with the given material. Children can listen or look at it, laugh at it, and extend it with their own redefinitions.