When the artists Jake and Dinos Chapman bought a series of paintings by Adolf Hitler for £115,000, many questioned the morality of paying for works produced by one of history's most brutal dictators. Yesterday, the brothers unveiled 13 of the watercolours, on which they had added psychedelic rainbows, stars and love hearts, and placed them back on the market for £685,000.

The Chapmans also unveiled a swastika-shaped sculpture of epic scale, based on Hell, a work destroyed by a 'mysterious'  fire in east London in 2004 which was bought by Charles Saatchi for a reported £500,000. Their latest work features hundreds of miniature Nazi soldiers carrying out acts of mass torture and cadavers hanging off trees. Naturally everyone says 'It's pure genius'.