Fun song fact : According to both John Lennon and Paul McCartney, the lyrics were largely derived from the literary style of Alice In Wonderland. Lennon had read and admired the works of Lewis Carroll, and the title of Julian's drawing reminded him of the "Wool and Water" chapter of Through the Looking Glass in which Alice floats in a "boat beneath a sunny sky"
It was Alice in the boat. She is buying an egg and it turns into Humpty-Dumpty. The woman serving in the shop turns into a sheep and the next minute they are rowing in a rowing boat somewhere and I was visualizing that.
McCartney remembered of the song's composition, "We did the whole thing like an Alice In Wonderland idea, being in a boat on the river ... Every so often it broke off and you saw Lucy in the sky with diamonds all over the sky. This Lucy was God, the Big Figure, the White Rabbit." He later recalled helping Lennon finish the song at Lennon's Kenwood home, specifically claiming he contributed the "newspaper taxis" and "cellophane flowers" lyrics, Lennon's 1968 interview with Rolling Stone magazine confirmed McCartney's contribution.
Lennon's original handwritten lyrics sold at auction in 2011 for $230,000.
