Tian Tai circular staircase design picture

Quick answer：

The design of a circular staircase on a rooftop typically involves architectural considerations for safety, aesthetics, and structural integrity. Circular staircases are often used in buildings with a circular or octagonal floor plan. They can be designed to be open or enclosed, and may include features like landing platforms, balusters, and handrails. The design process would involve selecting the appropriate materials, ensuring compliance with building codes, and creating a visually pleasing and functional staircase.