Isometric coordinate system and Ein-Stein-Tile
f(x,y), I(u,v) - Isometric Coordinate System
XGrid - Vertices in ICS
XGrid={(0,0), (1,-1), (1,-3/2), (2,-2), (5/2,-3), (2,-3), (3/2,-5/2), (1,-3), (0,-5/2), (0,-2), (-1/2,-3/2), (0,-1), (-1/2,0)}
YGrid - Reflected vertices in ICS
YGrid={(0,0), (-1,1), (-3/2,1), (-2,2), (-3,5/2), (-3,2), (-5/2,3/2), (-3,1), (-5/2,0), (-2,0), (-3/2,-1/2), (-1,0), (0,-1/2)}
XFig, YFig - Vertices in Cartesian Coordinates
D + reflected vertices rotate angle 210°
Fig_D=Polygon(D + Rotate(YFig, 210°))