The motion of walking, like the motion of breathing, is twofold.

First, a sympathetic cleaving to the earth with the foot: then the voluntary rejection, the spurning, the kicking away, the exultance in power and freedom.
From the upper voluntary center the child watches persistently, wilfully, for the attention of the mother: to be taken notice of, to be caressed, in short to exist in and through the mother's attention.
From this center, too, he coldly refuses to notice the mother, when she insists on too much attention.

This cold refusal is different from the active rejection of the lower center.

It is passive, but cold and negative.

It is the great force of our day.