What does Lucy in the Sky with Diamonds song mean?

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Tags

1. #school
2. #title
3. #diamonds
4. #realized
5. #lennon
6. #shortly
7. #nouns
8. #called
9. #letter
10. #julian
11. #release
12. #people
13. #nursery
14. #drawing
15. #inspired
16. #spelled
17. #after
18. #first