Portrait of a Boy is one of three Rembrandt paintings in Simon's collection. If Simon had had his way, there would have been four; the Metropolitan Museum of Art outbid him for Aristotle Contemplating the Bust of Homer. The Norton Simon Foundation hide caption

itoggle caption The Norton Simon Foundation

CC4 Nocagions, currently on display at the the Museum of Contemporary Art in Los Angeles, was conceived in 1973 by Brazilian artists Helio Oiticica and Neville D'Almeida. Visitors are invited to swim in the pool, and the museum even sells $16 disposable bathing suits in case you've come unprepared. Iwan Baan hide caption

itoggle caption Iwan Baan

Wafaa Bilal implanted a webcam in the back of his head. The camera is taking a picture a minute for a year, and the images are being streamed live at Mathaf, the Arab Museum of Modern Art. Wafaa Bilal hide caption

itoggle caption Wafaa Bilal

The Ghent Altarpiece, or Adoration of the Mystic Lamb, completed in 1432 by Jan van Eyck, is considered the first great painting of the Renaissance. Click here to see a larger version of the piece. Hubert Eyck/The Bridgeman Art Library/Getty Images hide caption

itoggle caption Hubert Eyck/The Bridgeman Art Library/Getty Images

From the exhibition "Fresh Flowers," a drawing created by artist David Hockney with the creative tool that's been fascinating him lately -- the iPad. Untitled, 10 July 2010 is one of hundreds of digital works showing on 40 screens in the Paris exhibition, which runs through Jan. 30. David Hockney hide caption

itoggle caption David Hockney

Steve Martin, seen here at an American Museum of Natural History event in November, has had an ugly experience at New York's 92nd Street Y. Michael Loccisano/Getty Images hide caption

itoggle caption Michael Loccisano/Getty Images

Central Park In The Fall is a 2010 work by "Painter of Light" artist Thomas Kinkade. The park, Kinkade writes, "is a place where a quick cab ride lets you escape the big city and immerse yourself in nature's brilliant color palette." Thomas Kinkade hide caption

itoggle caption Thomas Kinkade