Folding a Mitre into a Gnomon
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This Demonstration shows how to fold a mitre into a gnomon.
Contributed by: Izidor Hafner (January 2013)
Open content licensed under CC BY-NC-SA
In  the transformation is called a saddle-cyclic folding of a mitre to a gnomon.
 G. N. Frederickson, Piano-Hinged Dissections: Time to Fold!, Wellesley, MA: A. K. Peters, 2006 pp. 20–21.
"Folding a Mitre into a Gnomon"
Wolfram Demonstrations Project
Published: January 11 2013