Robert Smithson built Spiral Jetty in 1970 from thousands of tons of black basalt and earth extending into Utah’s Great Salt Lake. Unlike sculpture protected inside a museum, it lives with changing water levels, salt, weather and time. That seems essential rather than accidental. The environment is not merely around the artwork. It keeps participating in what the artwork becomes.
https://diaart.org/media/_file/brochures/spiral-jetty-7-18-for-website-3.pdf