by George Gadanidis (Western), Chris Yiu (Western) & Aileen Lin (U. Toronto)
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The idea for the symmetry puzzle in this story comes from Marcus du Sautoy's book, Symmetry - A Journey into the Patterns of Nature. See also his TED-Ed talk on Symmetry, reality's riddle.
In developing ways of engaging young children with symmetry (and ideas related to group theory), it has been very helpful to chat with mathematicians Denham Graham (Western University) and Peter Taylor (Queen's University).