ground floor sinking courtyard illustration

Quick answer：

The term 'ground floor sinking courtyard illustration' refers to a visual representation or diagram showing a courtyard that is sinking on the ground floor of a building. Such illustrations are often used in architectural design to depict potential issues with foundation stability or soil subsidence. In these illustrations, one would typically see the ground floor level depicted with an indentation or depression to indicate the sinking area, along with relevant annotations and structural elements to understand the context.