Revolver (Beatles album) group collective since 1962, and gave them an unprecedented amount of time to prepare for a new album. Writing in "The Beatles Forever", Nicholas Schaffner cites 1966 as the start of the band's "'psychedelic' period" and adds: "That adjective implies not only the influence of certain mind-altering chemicals, but also the freewheeling spectrum of wide-ranging colors that their new music seemed to evoke." Music journalist Carol Clerk describes "Revolver" as having been "decisively informed by acid", following John Lennon and George Harrison's continued experimentation with the drug LSD since the spring of 1965.<ref name="Clerk/Uncut"> Available at Rock's Backpages (subscription required).</ref>
Cluedo market until 2002/2003 when the current edition of Clue/Cluedo was first released. At this time, Hasbro produced a unified product across markets. The game was then localized with regional differences in spelling and naming conventions. During Cluedo's long history, eight unique Clue editions were published in North America (1949, '56/60, '60/63, '72, '86, '92, '96, and 2002), including miniaturized "travel" editions. However, only three distinct editions of Cluedo were released in the UK – the longest of which lasted 47 years from its introduction in 1949 until its first successor in 1996. The eighth North America and fourth UK editions