A pioneer in creating environmental sculpture, she used wood, stone and steel to produce dark shadows.

He is also known for his works in mixed-media figure painting, photography and environmental sculpture.

Q. What other materials do you use in your environmental sculptures?

Ms. Koch has a feeling for gradients as the truly environmental sculptures that they are.

"It is absolutely as important as any environmental sculpture," he said.

His environmental sculptures are displayed in open spaces around the country.

It remains one of the largest environmental sculptures in Europe.

Between the small, almost automatic drawing and the large environmental sculpture is 50 years of work.

His influence on contemporary land art, landscape architecture and environmental sculpture is evident in many works today.

Cigarette is a minimalist piece of environmental sculpture created by in 1961.