[T]he eye during our waking hours, exercises constantly its function of seeing; it is its constant habit; we always, as far as the bodily organ is concerned, see something, and we always see in the same degree, so that the occurrence of sight, as such, to the eye, is only the continuance of its necessary state of action, and awakes no attention whatsoever, except by the particular nature and quality of the sight. And thus, unless the minds of men are particularly directed to the impressions of sight, objects pass perpetually before the eyes without conveying any impression to the brain at all, and so pass actually unseen, not merely unnoticed, but in the full clear sense of the word, unseen.
— John Ruskin in Modern Painters
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