1-1-2-3
Rotate the bottom left cell of the tile 90 degrees clockwise; rotate the bottom right cell of the tile 180 degrees.
Shape 54
Shape 71
Shape 72
Shape 73
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1-3M-1-3M
Mirror, then rotate alternate columns 180 degrees. I call this one “Birds of a Feather” because when you turn it upside down, the left-facing nesting birds become right-facing nesting birds. Shape 23 Shape 24
1-1-1-2
The twenty-eight patterns you’ve just seen are Regular tessellations — symmetrical, orderly, each one a mirror of itself in some direction. They are, in their way, perfect. But perfection accounts for only twenty-eight of the five hundred and twelve possible patterns this system can generate. What about the other four hundred and eighty-four? They don’t…
