What does the passage explain? a natural phenomenon
a people’s culture
the origin of a people
the reason for the weather

what play?

explanation:

there is no play

the answer is fantasy

  this riddles' answer is library.

  the "leaves" are a reference to the books' pages that the library contains; the branches are a network of libraries that connect multiple libraries' collections, resources, and items in a system of a common database, integrating them; the branches' organization are a useful management tool for coordinating the multiple collections many libraries have.