Just a reminder that the song title initials spell LSD.
I worship everything Beatles - except this track!

Lennon always denied that the song was about LSD, instead claiming that it was inspired by a drawing of the same name by a then 3-year-old Julian:

From Wiki: John Lennon said that his inspiration for the song came when his three-year-old son Julian showed him a nursery school drawing that he called "Lucy – in the Sky with Diamonds",[4] depicting his classmate Lucy O'Donnell. Julian later recalled: "I don't know why I called it that or why it stood out from all my other drawings, but I obviously had an affection for Lucy at that age. I used to show Dad everything I'd built or painted at school, and this one sparked off the idea."[5][6][7] Ringo Starr witnessed the moment and said that Julian first uttered the song's title on returning home from nursery school.[4][8][9] Lennon later said, "I thought that's beautiful. I immediately wrote a song about it."[4]

According to Lennon, the lyrics were largely derived from the literary style of Lewis Carroll's novel Alice in Wonderland.[3][10] Lennon had read and admired Carroll's works, and the title of Julian's drawing reminded him of the "Which Dreamed It?" chapter of Through the Looking Glass, in which Alice floats in a "boat beneath a sunny sky".[11] Lennon recalled in a 1980 interview: "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."[3]

Paul 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."[10] He later recalled helping Lennon finish the song at Lennon's Kenwood home, specifically claiming he contributed the "newspaper taxis" and "cellophane flowers" lyrics.[8][12] Lennon's 1968 interview with Rolling Stone magazine confirmed McCartney's contribution.[13]

Lennon always denied that the song was about LSD, instead claiming that it was inspired by a drawing of the same name by a then 3-year-old Julian:

From Wiki: John Lennon said that his inspiration for the song came when his three-year-old son Julian showed him a nursery school drawing that he called "Lucy – in the Sky with Diamonds",[4] depicting his classmate Lucy O'Donnell. Julian later recalled: "I don't know why I called it that or why it stood out from all my other drawings, but I obviously had an affection for Lucy at that age. I used to show Dad everything I'd built or painted at school, and this one sparked off the idea."[5][6][7] Ringo Starr witnessed the moment and said that Julian first uttered the song's title on returning home from nursery school.[4][8][9] Lennon later said, "I thought that's beautiful. I immediately wrote a song about it."[4]

According to Lennon, the lyrics were largely derived from the literary style of Lewis Carroll's novel Alice in Wonderland.[3][10] Lennon had read and admired Carroll's works, and the title of Julian's drawing reminded him of the "Which Dreamed It?" chapter of Through the Looking Glass, in which Alice floats in a "boat beneath a sunny sky".[11] Lennon recalled in a 1980 interview: "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."[3]

Paul 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."[10] He later recalled helping Lennon finish the song at Lennon's Kenwood home, specifically claiming he contributed the "newspaper taxis" and "cellophane flowers" lyrics.[8][12] Lennon's 1968 interview with Rolling Stone magazine confirmed McCartney's contribution.[13]