Sky courtyard and sunken courtyard legend

Quick answer：

The legend of sky courtyard and sunken courtyard refers to the illustration or diagram that depicts the architectural design of a sky courtyard and a sunken courtyard. A sky courtyard is an open space in a building, often with a roof or skylight, allowing natural light and air to flow through the structure. A sunken courtyard, also known as a sunken garden, is a courtyard that is below the level of the surrounding ground. These diagrams are used in architecture and landscape design to visualize the layout and spatial characteristics of such courtyards.