Natural sunken courtyard effect

Quick answer：

A sunken courtyard is a garden or courtyard area that is below the level of the surrounding ground. This design creates a sense of intimacy and privacy. The 'natural' aspect refers to a design that is not heavily manipulated or landscaped, allowing natural elements like plants and water features to blend seamlessly with the space. This can be achieved through careful planning and the use of indigenous plants and materials. Sunken courtyards are often found in traditional architecture and can enhance the aesthetic and functional aspects of a building.