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This page could be improved by introducing and discussing the simple (Euclidean) concept first. Not all people coming to it are mathematicians, and one doesn't need to know anything about vectors in order to understand normals, nor should we be expected to delve deeper and deeper into increasingly complicated matters. Also, the word normal is used in the article, without explanation, as an adjective, though it's the probably the adjectival usage from which the noun -- meaning "normal line," "line normal" (to a surface) -- arises. Unfree (talk) 21:05, 22 December 2007 (UTC)[reply]
