Ten ping sunken courtyard drawing

Quick answer：

A sunken courtyard, also known as an underground courtyard, is a type of courtyard design where the courtyard is located below ground level, creating a semi-private space. The 'ten ping' refers to the area size, which is approximately 100 square meters. The drawing depicts the layout and architectural features of such a courtyard, which might include gardens, pools, or other elements to enhance the aesthetic and functional aspects of the space.