Williams, who has a long friendship with Michael Hill's family, particularly while growing up in Whangarei, is making a name for himself with his innovative leaf-form wind sculptures.
It was the first time Williams had shown any of his works in the South Island and the chance to put one in a "stunning environment" like The Hills was too good to miss, he said.
Williams has been working as a sculptor since 1991 after graduating from Elam School of Fine Arts at the University of Auckland.
Last year, he won the NZ Sculpture OnShore People's Choice Award for the second time.
Williams, whose Whangarei-based father, Clive, is also a sculptor, has pushed the boundaries, creating kinetic sculptures using methods not often employed in the art world.
"In the early 1990s, my father and I watched George Ricky's kinetic sculpture outside the Auckland Art Gallery and I was fascinated and inspired by its movement.
"I couldn't help thinking the work would express more as an organic form. I have always been interested in the organic side of art rather than being hard-edged."
Half a dozen of his wind sculptures have been commissioned for private and public collections, including a high-profile piece at Westfield in Albany, Auckland.
He is working on a sculpture for Housing New Zealand in Northcote, Auckland.
Williams said his sculpture in its location on the 15th fairway at The Hills was ideally suited to the area.
"It looks as if it has always been there, it fits in so well with the landscape," he said.
The sculpture responds to the wind and will move in the slightest breeze, due to the fine balance of the pods.
"The creation of this sculpture has been an intense project. Making something that appears so simple, which moves in such an elegant way, requires a lot of work behind the scenes.
"I strive to hide the engineering involvement, in order to keep it as an art piece. This is certainly my point of difference."
Mr Hill said it was a thrill to exhibit Williams' sculpture.
"It is a wonderful piece and it makes it more special because our families have been such good friends.
"Grant and my son, Mark, who is also a sculptor, went to school together and Grant's father was Mark's art teacher, so we have had a long association."
