“Impression: Any print made from a block, plate, or stone. Also, the physical contact of paper and printing surface which in turn affects the quality of the image. Thus terms like ‘good impression’ and ‘weak impression’ describe that effect of the contact.”
Excerpted from: Diamond, David G. The Bulfinch Pocket Dictionary of Art Terms. Boston: Little Brown, 1992.
Mark's Text Terminal 
Ah, the effect of the contact.
And it is used metaphorically to describe interactions between people.
So long as we remember our contact [including contact sheets in the photographic world] has effects; we can manage our impressions.
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Perfectly said.
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