Karl Ferris is an English music photographer/designer. He worked on album covers for Eric Clapton, Cream, Donovan, The Hollies and Jimi Hendrix.

The Fool were a Dutch design collective and band in the psychedelic style of art in British popular music in the late 1960s. They worked closely with The Beatles in London, painting George Harrison's Mini car, John Lennon's piano and a three story high psychedelic mural on the outside of the Apple Boutique on Baker Street. The group was named in reference to the Fool tarot card.