The home must never lose its contact with the world; it should never be regarded as the real world for which a man works. It is a place to rest in, to eat in, to work in; in it is the spirit of family life, redolent of affection, mutual aid and self-sacrifice; but more than these, it is the nodal point of affections, concerns and activity which radiate from it to the rest of the world. CHAPTER XV. PLAY, RECREATION, HUMOR AND PLEASURE SEEKING One of the great difficulties in thought is that often the same word expresses quite different concepts. Some superficial resemblance has taken possession of the mind and expressed itself in a unifying word, disregarding the fundamental differences. Take the word "play." The play of childhood is indeed a pleasurable activity to the child, but it is really his form of grappling with life, a serious pursuit of knowledge and a form of preparation for his adult activities. It is not a way of relaxation; on the contrary, in play he organizes his activities, shuffles and reshuffles his ideas and experiences, looking for the new combinations we call "imaginations." The kitten in its play prepares to catch its prey later on; and the child digging in a ditch and making believe "this is a house" and "this is a river" is a symbol of Man the mighty changing the face of Nature. The running and catching games like "Tag" and "I spy," "Hide and go seek," "Rellevo" are really war games, with training in endurance, agility, cool-headedness, cooperation and rivalry as their goals. Only as the child grows older, and there is placed on him the burden of school work, does play commence to change its serious nature and partake of the frivolous character of adult life.