What is the meaning behind the song Lucy in the Sky With Diamonds?

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Tags

1. #diamonds
2. #beatles
3. #called
4. #school
5. #lennon
6. #inspired
7. #march
8. #drawing
9. #julian
10. #nursery
11. #allegedly
12. #credited
13. #written
14. #recorded
15. #primarily
16. #partnership
17. #songwriting
18. #mccartney