Where does the phrase ivory tower come from?

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Tags

1. #allusion
2. #tower
3. #college
4. #least
5. #towers
6. #contemporary
7. #which
8. #origin
9. #university
10. #place
11. #famous
12. #ivory
13. #colour
14. #figurative
15. #phrase
16. #hawksmoor
17. #meaning
18. #souls
19. #oxford
20. #built
21. #isolation
22. #unworldly