Why are doors called doors?

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Tags

1. #infinite
2. #itself
3. #title
4. #everything
5. #perception
6. #derived
7. #appear
8. #cleansed
9. #huxley
10. #aldous
11. #heaven
12. #william
13. #marriage
14. #blake
15. #would
16. #doors
17. #their