Some of it is, yes, though not much. There's enough books and scrolls to keep her entertained for at least a while.

"Who're you?" the white-haired boy asks, getting up.

The spar winds to a close, and the two boys link fingers. One, a darker skinned boy who somewhat resembles the white-haired boy, smiles, while the other one (pale, with spiky black hair and a distinct resemblance to Rian) rolls his eyes.

For planning purposes she would like a more specific estimate.

"New arrival. And you?"

The number of books is hard to count at a glance; it's probably in the high hundreds or very low thousands.

He crosses his arms and doesn't answer.

"He's Tobirama," says the darker skinned boy. "I'm Hashirama, and this's Madara. Were you the one Miss Rian found?"

(Approximate average length of book or variation thereof? Are they already organized somehow?)

She wasn't particularly curious about his name (though she notes them, given that they said them) and is hardly going to be offended (though she notes the interaction dynamics). "I am."

(Mostly thin, a hundred pages at most, usually much less than that. They're organized loosely, but mostly by where they came from, not by subject. There's been some attempt at imposing a more transparent organization system, but it hasn't gotten far).

"What's your name?"

Alright. She will look at the system as far as it's gone and then note subjects herself, form organization in mind; has the mental structure to do it without needing to physically rearrange them. 

"I can be called Lee."

"Where're you from?"

"Most likely an alternate dimension."

Tobirama perks up at that. "How'd you get here, then?" he asks.

"My world has some magic with a habit of doing odd things."

"Does the magic do things on its own, then?"

"In approximately the way the weather 'does things on its own', yes. Ongoing debate on human origination or lack or magnitude thereof. I take it yours does not?"

"It's not really magic because we know how it works, but not really? Chakra's always doing something - keeping you warm, reinforcing your body - but it does the same things unless you direct it. ...I suppose nature chakra might be doing things on its own."

"Magic here is when you don't know how it works?"

"Magic is made up stuff that doesn't run on scientific principles."

"I see. That is not how it works in my world." And seems either absurd or rather significantly important to mention.

"Maybe it's a language difference," he concedes. 

"What are some examples of magic in your world?"

"Well, the superstitions usually involve the spirits - no one's proven they exist - " Tobirama starts.

"Little brother, you're going to annoy some spirit or another with that attitude, you know," Hashirama interjects.

Tobirama just rolls his eyes, and continues, louder, with: "There's the amulets and talismans, that're supposed to grant minor wishes or protect the home or ward off bad luck. That sort of stuff. The kuda-shou say they catch pipe foxes and use them for divinations and spells, but that's never saved them from ninja."

"I see." If what they have said is accurate her general conclusion would be a lower opinion of these people's approach with 'science'. But of course children are not generally a reliable source of world information.

"What does your magic do?" Madara asks. "Can it be shared?"

"Quite a lot. No, but items made with it can be."

"That's not an answer," Madara replies huffily. 

"That was not a very specific question."

"I could list things for what chakra does. Tobirama could give you all the fancy definitions. So what are some of the specific things your magic does?"