By Julian Lowell Coolidge

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**Extra info for A History of Geometrical Methods**

**Example text**

1. Masking tape drawing of a library (above) and the vanishing points of the drawing (below). 1 are two vanishing points V1 and V2 . The three lines which converge to V1 , for example, represent lines in the real world (architectural lines of the building) that are actually parallel to one another. Clearly, however, the images of these lines are not parallel, because they intersect. 2. 2. The vanishing point is where the line appears to vanish. 2 a viewer looks along various lines of sight (dashed lines) at a line L in the real world.

For more of the artist’s work, see the Plates section. 1 could be used to create a perspective drawing, by mathematically imitating what we did physically when we used masking tape to draw buildings on the windows in Chapter 1. However, neither of these techniques is useful to artists using traditional painting or drawing media, so we need to come up with some more practical techniques for perspective drawing. In this chapter we’ll concentrate on techniques for correctly subdividing and duplicating rectangles in one-point perspective.

Over half a mile long, the plant was the largest factory in the world under a single roof when it was completed in 1941. 4. In one-point perspective, the only lines with vanishing points are those orthogonal to the picture plane. We will say that a perspective drawing is in one-point perspective if (a) there is only one vanishing point V to which lines that are part of the drawing converge, and (b) those image lines that converge to V represent lines in the real world that are orthogonal to the picture plane.

### A History of Geometrical Methods by Julian Lowell Coolidge

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