Mashhad - the new courtyard

• The symmetry group of the tiling is 2*22 (cmm).
• All the internal angles of the constituent polygons are a multiple of 36°.
• Contains 36 regular two-pointed star polygons with vertex angle of 72°.
• There are four non-regular reflective tiles.
• The tiling satisfies the interlace condition and has five finite interlaces and two infinite interlaces with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 555 polygons.

1. Fig 12.12a of Brian Wichmann and David Wade. Islamic Design: a Mathematical Approach, Springer, 2017. ISBN 978-3-319-69. [ww] {}
2. Vol 3, Figure 103, page 118 (The new courtyard, Mashhad, Iran) of Mahmood Maher al-Naqsh. Design and execution of drawing in Iranian tilework, Islamic period, Reza Abbasi Museum, 1983. [iran] {Good collection of Iranian patterns, text in Persian} Available on Internet.

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