A freeform collage of words and dreamy images juxtaposed as Lennon's fervent imagination saw fit, "Glass Onion" served as his sequel to the previous year's "I Am the Walrus." The titular phrase, a nautical term for a large bottle kept shipboard and also, supposedly, a glass-topped coffin, appealed to Lennon for the seemingly contradictory notions of transparency and multiple layers. (He later suggested it as a potential name for a new Apple signing called the Iveys. They went with Badfinger instead.) A lyrical tour de force, "Glass Onion" teased overzealous fans with references to past songs including "Walrus," "Strawberry Fields Forever," "Fixing a Hole," "Lady Madonna," and "The Fool on the Hill," becoming the band's meta-masterwork.
The wordy track was far from finalized by the time the band met up at Harrison's home, but Lennon fully commits to his acoustic version of the song, confidently singing double-tracked gibberish syllables that would have made his literary hero Lewis Carroll proud. The lyrics for the first verse are repeated on the second, revealing a minor alternation to the more familiar version: "I told you about Strawberry Fields, well here's a place you know just as real." The "Oh yeah" bridge has yet to be added, so instead Lennon sings his one and only verse again, this time in dramatic halftime. Lennon emits a playful "Help!" before the song dissolves into another spell of "Jabberwocky" nonsense, fully disintegrating prior to the two-minute mark. As it was the last song recorded that day, perhaps his patience was wearing thin, or maybe he knew the band had more than enough in reserve to begin their new album.