After using scores of tessellations in a dozen maze books, the author decided to sort them by Heesch type, a decision that grew out of an attempt to see how many of the 28 Heesch types could be represented by a bird standing on the back of another bird. As he explored Heesch types, the author learned about the 93 isohedral classes of Gr?nbaum and Shepard, got comfortable with the 17 wallpaper groups, and found there was a difference between an anisohedral tile and an anisohedral tiling. The text tries to avoid unnecessary mathematical jargon as it comments on hundreds of illustrations of both abstract, geometrical tilings and the author's own Escher-like tilings that represent animals, birds, and other real-world objects.
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