One of the most important conquests made by man during his long evolution is certainly that of language, of a code enabling him to communicate every discovery, every experience, every perception through a symbol: which may by a sound but also - often - a graphic representation, a drawing. The difference between the two is that the graphic expression, unlike the spoken or written word, knows no borders: if the image of an object resembles reality, anyone in the world, in any period, would understand what object the image refers to.
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