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Dror Bar-Natan's {\color{red}tilings worksheet}: Classify the following
pictures according to the following possibilities: 2222, 333, 442, 632,
*2222, *333, *442, *632, 4*2, 3*3, 2*22, 22*, **, *o, oo, 22o, and 0
(the pictures come in \{context, pattern\} pairs).

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This worksheet: \url{http://drorbn.net/AcademicPensieve/2014-08/17Worlds/WorkSheet.pdf}

Solutions and more: \url{http://www.math.toronto.edu/~drorbn/Gallery/Symmetry/Tilings/}

Talk: \url{http://www.math.toronto.edu/~drorbn/Talks/ClassroomAdventures-1408/}

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