What rhetoric is the crystallization of countless human wisdom in library science books?
The library is a treasure house of books, which contains the crystallization of countless human wisdom.
This is a metaphor.
Metaphor is a common rhetorical device. It is a figure of speech to describe or explain things A with things B similar to things A, also known as "metaphor" and "analogy", which was called "bi" or "bi" in ancient China.