The shapes of all the parts and their interrelation are exactly described by the representation of that information in the set of drawings. Such description can be a lesser or greater challenge, depending on the complexity of the design. In the 15th century some of the leading artists and architects developed geometric schemes of perspective. Geometric perspective is a drawing method by which it is possible to depict a three-dimensional form as a two-dimensional image that closely resembles the scene as visualized by the human eye.
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