 Complete the following phrase:  His taste has mutated from American abstraction and minimalism to the Young British Artists YBAs, whose work he first saw at Goldsmiths Art School. At the YBAs 1990 Gambler exhibition, Saatchi bought Damien Hirsts first major animal installation, A Thousand Years. In 1991, he acquired major artworks by Hirst and Marc Quinn, becoming instrumental in launching their careers. His renown as a patron peaked in 1997, when part of his collection was shown at the Royal Academy as the exhibition 