So in the first few months of life, babies already seem to have solved a number of deep philosophical conundrums. They know how to use edges and patterns of movement to segregate the world onto separate objects. They know something about how those objects characteristically move. They know that those objects are part of a three-dimensional that comes from their different senses---they can link the feel of a nipple and its pink protuberance, the sound of a voice and the moving lips they see, the ball's exuberant bounce and its accompanying boing.