Gok (blue) madrasah

• The symmetry group of the tiling is *632 (p6m).
• All the internal angles of the constituent polygons are a multiple of 1.5°.
• Contains one regular hexagon.
• There are two non-regular reflective tiles.
• 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 139 polygons.

1. Page 233, Fig 96i. (Great Mosque, Divrigi, Turkey) of Jay Bonner. Islamic Geometric Patterns, Springer, 2016. ISBN 978144190216. [bonner] {Largest Islamic tile collection in print}(1228-9AD, 625-6AH)
2. Fig 51 (Gok madrasah, Sivas, Turkey) of Oktay Aslanapa. Turkish art and architecture, London : Faber, 1971. ISBN 057108781. [aslanapa] {422 p. : ill. (some col.), maps ; 29 cm}(1291AD, 690AH)
3. Page 99, Fig 4.15 (Hatuniye madrasah, Karaman, Turkey) of Eric Broug. Islamic Geometric Design, Thames and Hudson, 2013. ISBN 978050051695. [broug2] {Many excellent photos}(1382AD, 783AH)

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