40 Years After Dark Side: ‘Not one of my favourites,’ says the man behind the prism. The album’s designer talks to Paul Bignell about his creation

The stark but simple image of a prism on a black background is a far cry from the bombast of a giant pig flying over Battersea power station or flaming businessmen. Yet the cover of Pink Floyd's classic 1973 album The Dark Side of the Moon is probably one of the most instantly recognisable ever made. Yet despite bringing its creator, Storm Thorgerson, universal acclaim and the record becoming one of the biggest selling of all time, it doesn't rank as among his favourite designs. "It's not a favourite, pictorially – what we did with it later is more fun," the designer said from his home in north-west London. "To be associated with such an amazing album is great. But from an artistic point of view, I'm more interested in photographs.

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