56 years ago today, Pink Floyd's Atom Heart Mother was released in the UK, becoming the band's first number one album. The album's cover was famously hated by EMI, seemingly having nothing to do with the band or the music within, but the picture of Lulubelle III - taken nears Potters Bar. Storm Thorgerson said of the image: "I think the cow represents, in terms of the Pink Floyd, part of their humour, which I think is often underestimated or just unwritten about."