The project was conceived and staked out by him but built posthumously by his widow, the artist Nancy Holt.

In fact, artists such as Elyn Zimmerman, Jackie Ferrara, Nancy Holt and Mary Miss are considered among the best.

Now it is being brought to life by Nancy Holt, Mr. Smithson's widow, in conjunction with the current retrospective of his work at the Whitney Museum.

Smithson's works are little pieces of infinity, his widow, the artist Nancy Holt, has said.

"The trip to see the artwork brings people to a place they would not normally experience," said Nancy Holt, Smithson's widow and executor, who lives in New Mexico.

In Boomerang (1974), Serra taped Nancy Holt as she talks and hears her words played back to her after they have been delayed electronically.

Nancy Holt (born April 1938) is an American artist famous for her public sculpture, installation art and land art.

Nancy Holt was born in Worcester, Massachusetts.

Nancy Holt: Dark Star Park.

"Nancy Holt, Solar Rotary."