First floor converted to sunken courtyard actual scene

Quick answer：

A sunken courtyard, also known as a sunken garden, is a type of outdoor space that is below the level of the surrounding ground. It can be created by lowering the ground level around the courtyard or by building up the courtyard itself. This design feature is often used in modern architecture to create a more intimate and secluded outdoor environment. The 'actual scene' suggests that the image or description is meant to depict the real-life appearance of such a courtyard design.