Top-down sinking courtyard illustration

Quick answer：

A top-down sinking courtyard, also known as an inverted courtyard, is a traditional Chinese architectural layout. It features a courtyard that is raised above ground level, with buildings surrounding it at lower levels. This design aims to maximize privacy, insulation, and to create a serene environment. The illustration typically shows the layout of the courtyard, surrounding buildings, and any other structures like pavilions or gardens.