Britain's Prince William (L) speaks to school children taking a painting class during a tour of the Whitechapel Gallery in London, on May 11, 2009. The Gallery has premiered international artists such as Pablo Picasso, Frida Kahlo, Jackson Pollock, Mark Rothko and Nan Goldin, and provided a showcase for Britain's most significant artists from Gilbert & George to Lucian Freud, Peter Doig to Mark Wallinger.