In the 1960s, many fans saw the Beatles and the Rolling Stones as rivals. Paul McCartney accused the Stones of copying his band. Likewise, Mick Jagger felt the Beatles copied his band. In the end, though, there didn’t seem to be any bad blood between the two groups.
The Stones showed off the goodwill they had towards the Fab Four in 1967. That was the year the Stones released their psychedelic album, Their Satanic Majesties Request. The album’s memorable cover art features a message for the Beatles hidden in plain sight.
Satanic Majesties is often understood as the Stones’ attempt to equal the Beatles’ Sgt. Pepper’s Lonely Hearts Club Band. As such, Satanic Majesties has a psychedelic cover a la Sgt. Pepper’s. Though not as famous as its predecessor, the Satanic Majesties cover has secrets of its own.
Source: cheatsheet.com