In 1977, Isamu Noguchi's freind and founder of the Sōgetsu-ryū school of ikebana, Sofu Teshigahara, asked him to design an open space for flowers, of stones, and water titled “Heaven” in the Sogetsu Headquarters in Tokyo.
Isamu Noguchi and Hiroshi Teshigahara exhibition at Sogetsu Plaza in 1980.
The sculptures by Sachs were related to an exhibition recently held at the the Noguchi Museum in New York. It was Sachs' interpretation of chanoyu (Japanese tea ceremony) and the associated rituals. More about that, here.