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A "Yamout Boukhara Prayer Rug" from Turkistan. "Prayer Rugs are made and used by all people who profess the Moslem faith", ( above, pg. 13, from "Oriental Rugs and Carpets" by Stanley Reed, Octopus Books)
In this photo notations made by the artist, planning to reinterpret the design in spray-paint, can be seen drawn directly into the book.