Mosque of Gowhar, Mashhad

• The symmetry group of the tiling is *442 (p4m).
• All the internal angles of the constituent polygons are a multiple of 45°.
• Contains one square.
• Contains one regular 8-pointed star polygon with vertex angle of 90°.
• There is one non-regular reflective tile.
• The tiling satisfies the interlace condition and has one finite interlace and no infinite interlace with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 95 polygons.

1. Page 23, photo 10 (No Gunbad, Balkh, Afghanistan, Central Asia) from [bonner] (800-50AD, 183-235AH)
2. Page 118, Figure 62 (Minaret of Jam, Afghanistan, Central Asia) from [sourdel] (1190AD, 585AH)
3. Page 68 (al-Nasir Muhammed Madrasah, Cairo, Egypt) from [okane2] (1295-1303AD, 694-702AH)
4. Page 81 (Palazzo Pretorio, Gubbio, Italy. From painted wall surface) from [hessemer] (14th century AD)
5. Photo 269 (Mosque of Gowhar, Mashhad, Iran) from [pope] (1418AD, 821AH)
6. Photo by David Wade: IND 0319 (Agra Fort, India) from [wadei] (1573AD, 980AH)
7. Page 105, middle panel (Shir Dar madrasah, Samarkand, Central Asia. Facade) from [scerrato] (1619-36AD, 1028-45AH)
8. Photo by David Wade: IND 0510 (Itimad-ud-Daula's Tomb, Agra, India) from [wadei] (1626AD, 1035AH)
9. Page 158, top (Lahore Fort, Pakistan) from [degeorge2] (1631AD, 1040AH)
10. 1117-1905 (Seville, Spain. Glazed tile) from [vami]
11. E.3805-1938 (Cairo, Egypt. Sketchbook by James Wild) from [vami]
12. Page 66 (bottom) from [cahier]
13. Photo by David Wade: IRA 0830 (Imamzeda Darbi Islam, Isfahan, Iran) from [wadei]
14. Photo by David Wade: JAI 1033 (Haveli (merchants' houses), Jaiselmere, India) from [wadei]
15. Photo from M Sakkal (Junblat House, Aleppo, Syria) from [pc]

• Wade photo IND 0319
• Wade photo IND 0510
• Wade photo IRA 0830
• Wade photo JAI 1033
• Wade photo EPC 038
• V&A record Tile
• V&A record Drawing

• Tiling whose tile angles are a multiple of 45° and whose lengths are p+q*sqrt(2).

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