The concept of found objects has been used in art since Marcel Duchamp’s signed urinal. The artist David Mach uses coat hangers and the idea of up-cycling - taking low quality/priced objects and turning them into high quality/priced objects - to create some incredibly inspiring pieces. I don’t think sustainability was on his mind when he sculpted them, they are simply works of art; he even may have used new coat hangers. However, he does show how creativity, talent, and I suspect a lot of patience, can turn something as mundane and disposable as a coat hanger into something quite spectacular.