Folding a Mitre into a Gnomon

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This Demonstration shows how to fold a mitre into a gnomon.

In[1] the transformation is called a saddle-cyclic folding of a mitre to a gnomon.

[1] G. N. Frederickson, Piano-Hinged Dissections: Time to Fold!, Wellesley, MA: A. K. Peters, 2006 pp. 20–21.

Izidor Hafner