Tell a two-year-old you’re going to feed a make-believe candy bar to his teddy bear. Half an hour later you’ll still both be there, feeding a bear whose appetite never diminishes, and who demands, over and above his candy rations, ever-increasing supplies: of apples from imaginary orchards, of oats from bottomless feed bags, of carrots pulled fresh from the living room carpet. Spend an afternoon at this kind of play and you’ll remember the carrots at the day’s end. You may even smell them when you close your eyes. There is ample space in the brain for several worlds to occupy at once.
