 A 1960 oil painting by Nathan Oliveira, "Seated Figure with Pink Background," sold for $317,500 (including buyer's premium) at Sotheby's New York on November 12, 2002.During the 1990s Oliveira worked on a series of paintings of catenary curves based on observation of the flight of birds, including kestrels that had hovered outside the windows of his studio in the Stanford Hills.This series was dubbed the "Windhover" series by Oliveira's friend, poet Desmond Egan.