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Figure 1
A well arrowed hexagon is shown on the right. It has one pair of opposite sides whose arrows face in the same direction, thus providing an orientation for the tile. A double hexagon tile is on the left, the key feature being that the orientations of the inner and outer arrowed hexagons are at right angles. When three double hexagon tiles meet at a vertex, the gray parts around the vertex form corner hexagons (see Fig. 2[link]). The assumption of legality allows completion of the arrowing on the corner hexagons to well arrowed hexagons, as indicated on the right.

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ISSN: 2053-2733
Volume 73| Part 3| May 2017| Pages 246-256
https://doi.org/10.1107/S2053273317003576
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