Number of Horizontal Rhombuses
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How many horizontal rhombuses are there? Is there a rule for this?
Contributed by: Izidor Hafner (December 2012)
Open content licensed under CC BY-NC-SA
A calisson is a French sweet in the shape of two equilateral triangles edge to edge. They are packed in a hexagonal box. The puzzle is to show why the number of callisons pointing in each direction, in a fully packed box, must always be equal.
 D. Wells, The Penguin Book of Curious and Interesting Puzzles, New York: Penguin Books, 1993 p. 133.
"Number of Horizontal Rhombuses"
Wolfram Demonstrations Project
Published: December 20 2012