Escher's Alhambra tiling pattern

data166/P76 data172/E53 data173/MOR2430 data18/E41 data186/P119 data186/VA3 data208/E41
This pattern is unusual since the angles ensure that all the sides are in the same ratio. The angles are already determined by the regularity of the stars. This class lists a number of small variants from the one that Escher draw while at the Alhambra. They are all from Morocco or Spain (except the last which is a modern copy).