Sultan of Oman, Qaboos bin Said al Said

A major feature of the design of the interior is the prayer carpet which covers the floor of the prayer hall. It contains, 1,700,000,000 knots, weighs 21 tonnes and took four years to produce, and brings together the classical Persian Tabriz, Kashan and Isfahan design traditions. 28 colors in varying shades were used, the majority obtained from traditional vegetable dyes.