_The perceptive faculties_ (at any rate in childhood) _grow through the interpretation which expression gives them, and in no other way.

And the expressive faculties grow by interpreting perception, and in no other way_.

The child who tries to draw what he sees is training his power of observation, not less than his power of expression.

As he passes and repasses between the object of his perception and his representation of it, there is a continuous gain both to his vision and to his technique.

The more faithfully he tries to render his impression of the object, the more does that impression gain in truth and strength; and in proportion as the impression becomes truer and stronger, so does the rendering of it become more masterly and more correct.