For example, in order that the body image may elucidate allocheiria, it is not enough that each sensation of the left hand should take its place among generic images of all parts of the body acting in association to form around the left hand, as it were, a superimposed sketch of the body; these associations must be constantly subject to a unique law, the spatiality of the body must work downwards from the whole to the parts, the left hand and its position must be implied in a comprehensive bodily purpose and must originate Cf.