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Original “The Dark Side of the Moon” cover
The Dark Side of the Moon is the eighth studio album by the English progressive rock band Pink Floyd, released in March 1973. This album’s themes include conflict, greed, the passage of time, and mental illness, the latter partly inspired by Barrett’s deteriorating mental state.  The prism design was inspired by a photograph that Thorgerson had seen during a brainstorming session with Powell. The artwork was created by their associate, George Hardie. Hipgnosis offered the band a choice of seven designs, but all four members agreed that the prism was by far the best. The design represents three elements; the band’s stage lighting, the album lyrics, and Richard Wright’s request for a “simple and bold” design. The spectrum of light continues through to the gatefold--an idea that Waters came up with. Added shortly afterwards, the gatefold design also includes a visual representation of the heartbeat sound used throughout the album, and the back of the album cover contains Thorgerson’s suggestion of another prism recombining the spectrum of light, facilitating interesting layouts of the sleeve in record shops. The light band emanating from the prism on the album cover has six colours, missing indigo compared to the traditional division of the spectrum into red, orange, yellow, green, blue, indigo and violet. 
There are a few images on the internet where the album cover of “The Dark Side of the Moon”, has it’s prism removed and replaced by something else. The effect of this is having a white beam of light entering an object from the left, and a rainbow emerging from the object on the right.