1-1-2-1M
Rotate the lower left cell of the tile 90 degrees clockwise; mirror the lower right cell of the tile.
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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…
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1-4M-2M-3
Mirror, then rotate alternate columns 270 degrees counterclockwise, then rotate alternate rows 180 degrees.
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1-2M-4M-3
Mirror, then rotate alternate columns 90 degrees counterclockwise, then rotate alternate rows 180 degrees.
