The material used in the construction of Mughal forts in India, such as red sandstone and marble, often indicated the military and administrative purpose of the buildings. Mughal forts were often built to serve as both military strongholds and centers of government, and the use of sturdy, durable materials such as sandstone and marble helped to convey this dual purpose.
The use of these materials also helped to convey the wealth and power of the Mughal Empire, as they were expensive and required a great deal of labor to quarry and transport. The grandeur and ornate details of the Mughal forts, including the use of intricate carvings and inlaid tiles, further reinforced the military and administrative purpose of the buildings and demonstrated the Mughals' wealth and authority.
PS: this wasn't 30 points.