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Graphical projection is a protocol by which an image of an imaginary three-dimensional object is projected onto a plane surface without the aid of mathematical calculation. The projection is achieved by the use of imaginary "projectors". The projected, mental image becomes the technician’s vision of the desired, finished picture. By following the protocol the technician may produce the envisioned picture on a plane surface such as drawing paper. The protocols provide a uniform imaging procedure among people trained in technical graphics (mechanical drawing, computer aided design, etc.).