The following is an excerpt from a story by James Alexander from BBC News:

The art of Storm Thorgerson is as famous as the music it accompanies. A childhood friend of the founding members of PINK FLOYD, he went on to become their designer-in-chief, fashioning a string of eye-catching creations.

There was the mournful-looking cow on the front of Atom Heart Mother, the burning businessman on the sleeve of Wish You Were Here, the giant pig flying over Battersea Power Station and - most famously of all - the prism spreading a spectrum of colour across The Dark Side Of The Moon.

"It's a nice but simple idea," Thorgerson explains, surrounded by books and sketches in the same North London studio where the design took shape three decades ago.

"Refracting light through a prism is a common feature in nature, as in a rainbow. I would like to claim it, but unfortunately it's not mine!"

The idea was sparked by Pink Floyd's keyboard player, the late Richard Wright.

"He said, somewhat provocatively, 'Let's not have one of your photos, we've had your photos before. Can't we have a change? A cool graphic - something smart, tidy, elegant.'"

Thorgerson responded with seven rough suggestions that he pinned to the wall of Abbey Road studios.

The band took just seconds to plump for the prism, an image that seemed to perfectly embody the stark themes that underpin The Dark Side Of The Moon.

Although Thorgerson remains best-known for his collaborations with Pink Floyd, his design credits also include albums by LED ZEPPELIN and PETER GABRIEL.

Now he has collected his favourites into a limited edition box set, alongside signed prints and previously unseen drawings.

He continues to be in demand and says he's untroubled by the shrinking space given to album art.

"I think it's more about the design that matters. So, once that has been uncovered, then you have an image that will hopefully work everywhere and always," he says.

"I don't worry if it's an LP, CD or MP3 - I always see it as very big. Even though it may be very small, it will get used big somewhere - a hoarding or a poster or an advert in a magazine."

Watch Pink Floyd designer Storm Thorgerson talking about highlights of his career at this location.