Play, like other instincts, besides serving the present, looks in two directions, into the past and into the future. From the past come the shadowy interests which, taking form from the touch of our environment, determine the character of the play activities. From the future come the premonitions of the activities that are to be. The boy adjusting himself to the requirements of the game, seeking control over his companions or giving in to them, is practicing in miniature the larger game which he will play in business or profession a little later. The girl in her playhouse, surrounded by a nondescript family of dolls and pets, is unconsciously looking forward to a more perfect life when the responsibilities shall be a little more real. So let us not grudge our children the play day of youth. 5. OTHER USEFUL INSTINCTS Many other instincts ripen during the stage of youth and play their part in the development of the individual. CURIOSITY.--It is inherent in every normal person to want to investigate and _know_. The child looks out with wonder and fascination on a world he does not understand, and at once begins to ask questions and try experiments. Every new object is approached in a spirit of inquiry. Interest is omnivorous, feeding upon every phase of environment. Nothing is too simple or too complex to demand attention and exploration, so that it vitally touches the child's activities and experience. The momentum given the individual by curiosity toward learning and mastering his world is incalculable. Imagine the impossible task of teaching children what they had no desire or inclination to know! Think of trying to lead them to investigate matters concerning which they felt only a supreme indifference! Indeed one of the greatest problems of education is to keep curiosity alive and fresh so that its compelling influence may promote effort and action. One of the greatest secrets of eternal youth is also found in retaining the spontaneous curiosity of youth after the youthful years are past. MANIPULATION.--This is the rather unsatisfactory name for the universal tendency to _handle_, _do_ or _make_ something. The young child builds with its blocks, constructs fences and pens and caves and houses, and a score of other objects. The older child, supplied with implements and tools, enters upon more ambitious projects and revels in the joy of creation as he makes boats and boxes, soldiers and swords, kites, play-houses and what-not. Even as adults we are moved by a desire to express ourselves through making or creating that which will represent our ingenuity and skill. The tendency of children to destroy is not from wantonness, but rather from a desire to manipulate.