The original quadraphonic mix, created by Alan Parsons, was commissioned by EMI but never endorsed by Pink Floyd, as Parsons was disappointed with his mix. To celebrate the album's 30th anniversary, an updated surround version was released in 2003. The band elected not to use Parsons' quadraphonic mix (done shortly after the original release), and instead had engineer James Guthrie create a new 5.1 channel surround sound mix on the SACD format. Guthrie had worked with Pink Floyd since co-producing and engineering their eleventh album, "The Wall", and had previously worked on surround versions of "The Wall" for DVD-Video and Waters' "In the Flesh" for SACD. Speaking in 2003, Alan Parsons expressed some disappointment with Guthrie's SACD mix, suggesting that Guthrie was "possibly a little too true to the original mix", but was generally complimentary. The 30th-anniversary edition won four Surround Music Awards in 2003, and has since sold more than 800,000 copies. The cover image was created by a team of designers including Storm Thorgerson. The image is a photograph of a custom-made stained glass window, built to match the exact dimensions and proportions of the original prism design. Transparent glass, held in place by strips of lead, was used in place of the opaque colours of the original. The idea is derived from the "sense of purity in the sound quality, being 5.1 surround sound ..." The image was created out of a desire to be "the same but different, such that the design was clearly DSotM, still the recognisable prism design, but was different and hence new".