The original artwork for a poster advertising Jimi Hendrix's 1967 concert at the Fillmore Auditorium in San Francisco – depicting the guitarist as a psychedelic Native American chief with a hunting bow in one hand and a peace pipe in the other – was sold in 2008 by Bonhams for $72,000.

[6][8][9][10] He took part in Ascott's revolutionary Groundcourse, the first year of which focused on changing preconceptions and involved exercises such as students being subjected to continuous pulses of light and darkness in the lecture theatre before being asked to walk over a floor covered with glass marbles.

Ascott later recalled that one of the aims was to create disorientation "within an environment that is sometimes unexpectedly confusing, where [the artist] is faced with problems that seem absurd, aimless or terrifying … Pete Townshend sat on a trolley for three weeks, because he wasn't allowed to use his legs and [Brian] Eno went around with a bag on his head.

[15] Following a period working as a freelance journalist, he opened a boutique at 488 King's Road, Chelsea, in partnership with his girlfriend Sheila Cohen and John Pearse, a Savile Row–trained tailor.

They acquired the premises in December 1965 and opened as Granny Takes a Trip (GTT) in February 1966, initially selling Edwardian and antique clothes with what author Paul Gorman describes as "an up-to-date feel that appealed to the young hippie denizens of what was becoming known as Swinging London".

[19][20] They set up a small studio on Princedale Road in Holland Park, close to the Oz offices, and where, according to the magazine's editor Richard Neville, "their sole inspiration was LSD and their regular 'tripping partner' was Pete Townshend.