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the truly essential. The reality of a room, for instance, was to be found in the vacant space enclosed by the roof and 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 Taoteiking. In jiu-jitsu one seeks to draw