图片 of sunken courtyard on rooftop

Quick answer：

A sunken courtyard on a rooftop is a design feature where a courtyard is built into the roof of a building. These courtyards often provide a peaceful outdoor space within an urban environment. They can be used for various purposes such as gardening, relaxation, or as a recreational area. The design can vary widely, from small, intimate spaces to larger, more open areas. Photos of such courtyards can be found in architectural magazines, design websites, or property listings featuring innovative building designs.