Acolor edge is a manifestation of what element of composition

A color edge is a manifestation of what element of composition? Which of the following is not a purpose for which artists utilize line? Which of the following is one of the three basic characteristics

Analysis of da vinci's vitruvian man. another of da vinci's most famous works is that of the vitruvian man, created around 1490. the official title of the drawing is “le proporzioni del corpo umano secondo vitruvio,” or “the proportions of the human body according to vitruvius.”