Two Blocks in Perspective
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This Demonstration shows two blocks in perspective from two vanishing points. Thinking of the blocks as buildings, you can choose to see a part of the street between them. You can also see the nets of the blocks that vary under the transformation.
Contributed by: Izidor Hafner (February 2016)
Open content licensed under CC BY-NC-SA
 M. Kline, Mathematics for the Nonmathematician, New York: Dover, 1985 pp. 202–231.