The Taoists claimed that the comedy of life could be made more interesting if everyone would preserve the unities. To keep the proportion of things and give place to others without losing one's own position was the secret of success in the mundane drama. We must know the whole play in order to properly act our parts; the conception of totality must never be lost in that of the individual. This Laotse illustrates by his favourite metaphor of the Vacuum. He claimed that only in vacuum lay the truly essential. The reality of a room, for instance, was to be found in the vacant space enclosed by the roof and the walls, not in the roof and walls themselves. The usefulness of a water pitcher dwelt in the emptiness where water might be put, not in the form of the pitcher or the material of which it was made. Vacuum is all potent because all containing. In vacuum alone motion becomes possible. One who could make of himself a vacuum into which others might freely enter would become master of all situations. The whole can always dominate the part. These Taoists' ideas have greatly influenced all our theories of action, even to those of fencing and wrestling. Jiu-jitsu, the Japanese art of self-defence, owes its name to a passage in the Tao-teking. In jiu-jitsu one seeks to draw out and exhaust the enemy's strength by non-resistance, vacuum, while conserving one's own strength for victory in the final struggle. In art the importance of the same principle is illustrated by the value of suggestion. In leaving something unsaid the beholder is given a chance to complete the idea and thus a great masterpiece irresistibly rivets your attention until you seem to become actually a part of it. A vacuum is there for you to enter and fill up the full measure of your aesthetic emotion. He who had made himself master of the art of living was the Real man of the Taoist. At birth he enters the realm of dreams only to awaken to reality at death. He tempers his own brightness in order to merge himself into the obscurity of others. He is "reluctant, as one who crosses a stream in winter; hesitating as one who fears the neighbourhood; respectful, like a guest; trembling, like ice that is about to melt; unassuming, like a piece of wood not yet carved; vacant, like a valley; formless, like troubled waters." To him the three jewels of life were Pity, Economy, and Modesty.