Ágnes Dénes (born May 31, 1931) is a Hungarian-born artist and a leading figure in conceptual, environmental, and ecological art.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Agnes_Denes
The Living Pyramid by Ágnes Dénes
2015 / Wood, soil, grasses, and flowers / Height: 30′ / Socrates Sculpture Park, Long Island City, NY
Ágnes Dénes on Artnet: http://www.artnet.com/artists/agnes-denes/