Lasso structures are architectural features that utilize cables and a tensioned membrane to create a dynamic and flexible form. These structures are often used for roofs and can be seen in various real-world applications. The term 'tensioned membrane' refers to a material, such as fabric, which is stretched tightly over a frame or structure to form a durable and weather-resistant covering. The provided subject seems to be a reference to a photograph showcasing a lasso structure with a tensioned membrane in a real-world setting.