The Fool were a Dutch art/design/music collective who had a tremendous impact on London psychedelic scene between 1967 and 1968. Although mostly known for their work with The Beatles, they also designed stage clothes and album covers for Cream, The Move and Incredible String Band. They also designed clothes and interiors for various films and theatre performances and they even recorded an album. The Beatles were such fans of their work, that they left them in charge of their Apple Boutique - with disastrous results.
The Fool consisted of Marijke Koger, Simon Posthuma, Yosha Leeger and Englishman Barry Finch - Leeger's fiancee. Koger was a 'leader' of the group.
Marijke Koger and Simon Posthuma in Rave magazine, 1968
On the set of Wonderwall by Phillippe Le Tellier
To those who wish to find out more about the story of Apple, I recommend a book The Last Cocktail Party by Richard DeLillo.
Bibliography and Images
Paolo Hewitt, Fab Gear - The Beatles And Fashion, Prestel, 2011