String Mandalas are constructed using a very strong polyester thread. The thread is woven by stretching it in straight lines between pins. The pins are arranged in precise geometric patterns. The beautiful curves which are created are optical illusions formed by the straight lines intersecting according to mathematical principles. The time involved to construct a design varies from a few hours to weeks depending on its complexity. 101 points http://www.stringmandalas.com/Mandalas/index.html