David Hockney's 'Portrait of an Artist (Pool with Two Figures)' was sold at auction by Christie's in New York for $90.3 million. AP
David Hockney's 'Portrait of an Artist (Pool with Two Figures)' was sold at auction by Christie's in New York for $90.3 million. AP

'Salvator Mundi' and 'Rabbit': why are some people willing to spend so much money on art?