Mosque of ibn Tulun (876-879)

• The symmetry group of the tiling is *632 (p6m).
• All the internal angles of the constituent polygons are a multiple of 60°.
• Contains one regular two-pointed star polygon with vertex angle of 60°.
• Contains one regular hexagon.
• Contains one regular 6-pointed star polygon with vertex angle of 60°.
• There is one non-regular reflective tile.
• The tiling satisfies the interlace condition and has no finite interlace and two infinite interlaces.
• The tiling is edge-to-edge.
• As drawn, contains about 223 polygons.

• Figure 197, page 200 (Cairo, Example of Pierced Windows (Qamariyyah) After Prisse d'Avennes, No colouring) from [briggs]
• Figure 52 (Plate 29, Masjid-i-Jami, Varzaneh, Iran) from [elsaid]
• Plate 157 (Morocco, Tin-glazed earthenware mosaic) from [humbert]

• Wade photo TUR 0132
• Wade photo EGY 0334x

v22