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Fold the sides of a square prism at half height until the top and bottom squares meet. The movement corresponds to that of the Sarrus linkage, which converts a limited circular motion to a linear motion. Stack such prisms to produce a retractable structure.
Contributed by: Sándor Kabai (September 2007)
Open content licensed under CC BY-NC-SA
Wolfram Demonstrations Project
Published: September 21 2007