Origins and architecture of the Taj Mahal order to all the elements of the Taj Mahal. Hierarchical ordering of architecture is commonly used to emphasise particular elements of a design and to create drama. In the Taj Mahal, the hierarchical use of red sandstone and white marble contributes manifold "symbolic" significance. The Mughals were elaborating on a concept which traced its roots to earlier Hindu practices, set out in the Vishnudharmottara Purana, which recommended white stone for buildings for the Brahmins (priestly caste) and red stone for members of the Kshatriyas (warrior caste). By building structures that employed such colour-coding, the Mughals identified themselves with the two
Taj Mahal the government erected scaffolding to disguise the building in anticipation of air attacks by the Japanese Air Force. During the India-Pakistan wars of 1965 and 1971, scaffolding was again erected to mislead bomber pilots. More recent threats have come from environmental pollution on the banks of the Yamuna River including acid rain due to the Mathura Oil Refinery, which was opposed by Supreme Court of India directives. The pollution has been turning the Taj Mahal yellow. To help control the pollution, the Indian government has set up the Taj Trapezium Zone (TTZ), a area around the monument where strict emissions