An open sunken courtyard rendering

Quick answer：

A sunken courtyard, also known as a sunken garden or sunken plaza, is a landscape feature where the garden or courtyard is at a lower level than the surrounding area. This design often creates a sense of intimacy and seclusion. Renderings of such spaces typically showcase the architectural details, landscaping, and the overall ambiance of the sunken courtyard. They are used in architectural presentations and marketing materials to visualize the design before construction.