"Abstraktes Bild (809-4)," a 1994 painting by Gerhard Richter. The painting was sold by the rock guitarist Eric Clapton in a Sotheby's "Frieze Week" auction of contemporary works in London on Oct. 12. The work sold for 21.3 million pounds ($34.2 million) -- more than 30 times what Clapton paid for it in 2001. Source: Sotheby's via Bloomberg.