 Gibbs is one of New Zealand's leading art collectors, and since 1991 has been establishing a sprawling sculpture park at Gibbs Farm, which is located on Kaipara Harbour on New Zealand's North Island, north of Auckland in the Rodney district.Among the art works installed on The Farm are monumental pieces by contemporary artists including Daniel Buren, Neil Dawson, Marijke de Goey, Andy Goldsworthy, Anish Kapoor, George Rickey, Richard Serra and Bernar Venet.Frustrated by the extreme tidal nature of the Kaipara Harbour, that forms the western boundary of his farm, Gibbs began experimenting with amphibious vehicles in the early 1990s.