A smiley faced cloud floats over the River Thames and past St. Paul's Cathedral, in London, Wednesday Feb. 25, 2009, as part of the art installation entitled 'Happy Cloud', by British artist Stuart Semple, who was releasing 2057 smiling clouds into the sky over London, from outside the Tate Modern gallery. AP Photo logo AP Photo 11 months ago

A smiley faced cloud floats over the River Thames and past St. Paul's Cathedral, in London, Wednesday Feb. 25, 2009, as part of the art installation entitled 'Happy Cloud', by British artist Stuart Semple, who was releasing 2057 smiling clouds into the sky over London, from outside the Tate Modern gallery.