Pink Floyd and EMI Music will mark the 40th anniversary of the original UK release of The Dark Side of The Moon on Sunday (March 24th), as fans around the globe unite to turn a specially designed moon dark. Centred around a global playback of the album on PinkFloyd.com, each memory, thought and photo tweeted as fans rediscover the album will count towards the creation of a dark side of the moon.

Starting at 00:01am GMT on Sunday, for the entire day, fans all over the world will be able to share thoughts and comments via Twitter using #DarkSide40 and witness the impact as the volume of messages combine to turn the moon dark.

In the meantime, as we noted last week, each day the various official Floyd sites (pinkfloyd.com, Facebook, Twitter, Tumblr and Instagram) have been revealing a lovely selection of prism images by the band's long-term friend and artist, Storm Thorgerson - some of which have been newly created for this 40th anniversary. These will continue to be posted until Saturday, March 23rd, and if you've yet to check them out on PinkFloyd.com, pop over there now to see what has been posted so far...