"Cancer begins and ends with people. In the midst of scientific abstraction, it is sometimes possible to forget this one basic fact. Doctors treat diseases but they also treat people, and this precondition of their professional existence sometimes pulls them in two directions at once."

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Essentially, perspective is a form of abstraction. It simplifies the relationship between eye, brain and object. It is an ideal view, imagined as being seen by a one-eyed, motionless person who is clearly detached from what he sees. It makes a God of the spectator, who becomes the person on whom the whole world converges, the Unmoved Onlooker.

— Robert Hughes