"Everything is new to the newborn child. His gradual grasp of his environment and of the world around him are discoveries which, in experiential scope and quality, go far beyond any discovery that the most adventurous and daring explorer will ever make in his adult ife. No Columbus, no Marco Polo has ever seen stranger and more fascinating and thoroughly absorbing sights than the child that learns to perceive, to taste, to smell, to touch, to hear and see, and to use his body, his senses and his mind. No wonder the child shows an insatiable curiosity. He has the whole world to discover."