## Clamshell

### Info

A substitution tiling with three prototiles.
The substitution rule is given for only two of the three tiles. The third tile (yellow) is substituted by nothing.

The discoverer gives credits to Veit Elser for suggesting the shape of the tiles.

### References

[PR]
Priebe-Frank, N and Robinson, E A jr
Generalized beta-expansions, substitution tilings, and local finiteness
preprint A0506098