Zenpundit has sent an invitation for us to disclose our Quantum Library. If our Library entails the books we've read and our Anti-library's make up are all the books we've yet to read then what is the Quantum Library? From the Innovationist's Three Hierarchical Layers of Books:
The Quantum-Library is the layer that co-exists as a member of both the Library and the Anti-Library. It is something you may have read, but when read again with a different perspective it exists in another form. These type’s of books are the ultimate for a bibliophile.
An interesting concept and I'd encourage all to give the post a read in it's entirety.
There are plenty of books that I've read multiple times, simply because they're that good. However few exist that when re-read are so deep as to invite this quantum shift in perspective and form as described above and so my list is a bit short:
The Art of War
Like I said, it's a bit short. I suspect if Munz posts his it will be longer given his proclivity for some rather deep reading subjects.