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Gandalf researching magic rings in the archives of Minas Tirith
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There are no less than 3 sources of fire in that image containing a room full of extremely dry documents that are likely to all be hundreds to possibly thousands of years old. Librarians were much more lax in those days I guess.
That said, I suppose Gandalf had the ring of fire, so he could control the fire and prevent it from doing any damage.