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Comments on Lecture 13 "Ambiguous Tiling"
Comment 1. Tile postures for ambiguous tiling
Both the tile "Drum" and the tile "Fan" can form tilings if we place copies of the tiles by translation and 90-degree rotations, as shown in the left diagrams. In or der to make the ambiguous tiling, the two tiles should have one-to-one correspondence in its oridinal postures and the rotated postures. The left postures are the only possible pair that satisfies the condition.
Comment 2. Reference on amgibuous tiling
K. Sugihara: Ambiguous tiling. Computer Aided Geometric Design, 2020 (in print).