The design is heavily influenced by Islamic tradition, with the five tiers of the two skyscrapers representing the five pillars of Islam, and they reportedly took a total of six years and $1.6bn to construct. Since the 899,000 sq ft of stainless steel used in construction would attract a lot of heat, 590,000 sq ft of laminated glass was installed to reflect UV rays. Cleaning every single glass panel – the equivalent of 10 football fields – would take almost two months!