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1-1-1-1
This is the first pattern in the Library. All other patterns derive from this one. This is the only single-shape tessellation in the Library. One shape — the bird — fits against itself to fill the plane perfectly.
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.
1-2-1-2
Rotate alternate columns 90 degrees clockwise.
1-1-4-4
Rotate alternate rows 270 degrees clockwise.
1-4M-4M-1
Mirror, then rotate alternate cells 270 degrees counterclockwise.
