Koran, Mamluk, probably Cairo

• The symmetry group of the tiling is *442 (p4m).
• All the internal angles of the constituent polygons are a multiple of 7.5°.
• Contains three equilateral triangles.
• Contains one regular octagon.
• Contains one regular four-pointed star polygon with vertex angle of 60°.
• Contains one regular 12-pointed star polygon with vertex angle of 90°.
• There are four non-regular reflective tiles (including one kite).
• The tiling satisfies the interlace condition and has three finite interlaces and no infinite interlace with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 619 polygons.

1. Alamy photo EB3AXK (Minbar, al-Salih Tala'i mosque, Cairo, Egypt) of Not specific. Personal Communication, Information sent to the author, 21c. [pc] (1300-50AD, 699-750AH)
2. E.3842:50-1938 (Cairo, Egypt. Sketchbook by James Wild) of V&A collections website. Website: collections.vam.ac.uk, UK, 2015. [vami] {Website}
3. Page 42 (Koran, Mamluk, probably Cairo, Egypt) of David James. The Master scribes: Qur'ans of the 10th to 14th c, Oxford, 1992. ISBN 019727601. [james] {p240}

• V&A record Sketchbook

v54