REFRACTION
that the edges of things are sharp and hard as a rule. This is amply proved by the photographic lens, which gives us a clear-cut definition all over the plate which the human eye could never hope to compass in looking at nature through its own imperfect instrument. And if the camera were still more perfect, if there were no question of focus, it would probably give us an edge everywhere as sharp as the traditional Toledo blade.
But this scientific fact would still remain an artistic lie. Fortunately, we painters have to do only with impressions and not with realities. For these impressions we must rely solely upon the lenses which God has given us; and as a painter I congratulate myself daily that the lens of the human eye was designed not at all after the pattern of the lenses adapted to the camera, the
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