The Malwiya minaret in Iraq, near Baghdad, is a 52m high, 1150 year old spiral-shaped structure built from the local sandstone. It is fascinating to me for lots of reasons, but relevant to this project because of its form.
Unlike most minarets, the Malwiya was not used for the “call to prayer”; its height made it impractical for such use. However, it is visible from a considerable distance in the area around Samarra and therefore may have been designed as a strong visual statement of the presence of Islam in theTigris Valley.
Extract from the Wikipedia article