From Wikipedia…

Philip Garris, well known for painting many Grateful Dead album covers, created the album’s emblem after listening to a lyric from the song “Manuela Run” (“You better watch that sword that’s hanging over you”) which referred to the Sword of Damocles. The sword also represented the band’s powerful, hard-edge sound, and, due to their ability to play many types of music, Garris made the sword double-edged to show their versatility. The iron ring represented a piece of work being constructed (the record itself), and the ribbons represented the Year of the Child.

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