Red Fort, Delhi

• 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.
• There is one non-regular reflective tile.
• The tiling does not satisfy the two-colour condition.
• The tiling is edge-to-edge.
• As drawn, contains about 174 polygons.

1. Photo by David Wade: IND 0103 (Alai Darwaza, Delhi, India) of David Wade. Website: patterninislamicart.com, UK, 2015. [wadei] {Website}(1305AD, 704AH)
2. (Fatehpur Sikri, Turkish Sultana's House, India) of E W Smith,. The Moghul Architecture of Fathpur-Sikri, Archaeological Survey of India, 1896. [smith2] (1571AD, 978AH)
3. Figure 4.16, page 101 (Red Fort, Delhi, India) of S J Abas and A S Salman. Symmetries of Islamic Geometrical Patterns, World Scientific, 1995. ISBN 981021704. [abas] {Very many patterns in black and white, no sources given.}(17th century AD)

• Wade photo IND 0103
• Wade photo EPC 036

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