Underground Courtyard Scene on Negative First Floor

Quick answer：

An underground courtyard, also known as a下沉式庭院, refers to a courtyard that is situated below the level of the surrounding ground. This design is often used in multi-story buildings to create a private, secluded space. The term 'Negative First Floor' indicates that the courtyard is located one floor below the ground level. Realistic scenes of such courtyards can be found in architectural photography or design plans.