Tensioned membrane appearance refers to the visual aspect of a structure made with tensioned membranes, often used in architecture for creating lightweight, flexible, and visually striking designs. These membranes are typically made of materials like ETFE (Ethylene Tetrafluoroethylene) or PTFE (Polytetrafluoroethylene) and are stretched tightly over a frame or structure to form a smooth, durable surface. The design allows for efficient use of space and natural lighting, and the tensioned membrane can be shaped into various forms, contributing to the unique aesthetic of modern buildings.