Roof greening eight-trigrams diagram

Quick answer：

Roof greening refers to the practice of planting vegetation on rooftops, which can provide insulation, improve air quality, and create green spaces in urban areas. The eight-trigrams diagram, also known as the Bagua, is a key concept in Chinese metaphysics and feng shui. It represents the fundamental elements of the universe and is often used to balance and harmonize the energy of a space. In the context of roof greening, the diagram may be used to design a layout that promotes harmony and benefits the occupants or the environment.