What is the Tesseract in the movie interstellar?

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Tags

1. #tesseract
2. #larger
3. #himself
4. #journey
5. #created
6. #inside
7. #lands
8. #within
9. #basic
10. #hotel
11. #finds
12. #nolan
13. #complex
14. #cooper
15. #gargantua
16. #strange
17. #suite
18. #interstellar
19. #after