The discoverer and the poet are inventors; and they are so because their mental vision detects the unapparent, unsuspected facts, almost as vividly as ocular vision rests on the apparent and familiar.
The intensity of vision in the artist and of vividness in his creations are the sole tests of his imaginative power.
As all Art depends on Vision, so the different kinds of Art depend on the different ways in which minds look at things.