Thus we know that a child has the impulse to make use of his motor apparatus, but this impulse is strengthened when another person makes a movement which attracts the child’s attention. The concept as such produces a mild inclination and the natural impulse to move weighs down the scale. The little girl inherits an instinct for nursing; alone, it would probably not be strong enough to originate nursing play, and quite as little would the idea of the movements involved which the child acquires from watching her mother have that result (as witness, the boy). The two together produce the familiar result. In the same way the boy’s fighting instinct impels him to imitate all warlike demonstrations. We may say that the “what” of the subject is answered by the movement idea and the “that” predominantly by the corresponding instinct, though acquired necessity of course may do the same thing. Moreover, imitation has a special affinity for curiosity and the fighting instinct. The former asks concerning an unusual movement by another, “How does he do it?” and an effort to experiment at once ensues, while the fighting instinct is on the alert at the perception of a difficulty, and loses no time in overcoming it in order to enjoy the “I can, too,” of success. This success may be a triumph over the model, since if no superiority is proved we arrogate to ourselves a capacity which up to this time has been the property of another.[539] It may, however, be mere pleasure in overcoming the difficulty, as when we try to imitate qualities which we admire in another, adding to the combative impulse the desire to make one’s self agreeable or to subordinate others. But so far as conscious playful imitation is directly concerned, the struggle with difficulties is still in the foreground. We must remember, too, that with many of the higher kinds of imitation—pre-eminently so with that which may be called constructive, since its material is invariably appropriated from foreign sources—the pleasure which is derived from recognition and from illusion adds to its play the powerful charm of imagination.