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I was wondering why the Room of Requirement can predict the future, and whether it needs to be empty in order to change?

I clearly remember that in Harry Potter and the Order of Phoenix, Harry thinks he really needs a whistle, and immediately discovers one on the shelf beside him even though it had not been there moments before. (The room also kept adding beds and even toilets in Deathly Hallows.) So, did the room predict he would need the whistle, or did it create one when he thought of it?

In Harry Potter and the Deathly Hallows, Ginny, Tonks, and Mrs. Weasley were inside and needed to leave it so the trio can change the room into the Room of Hidden Things. But if the room can change and create whistles, why can't it create or summon Ravenclaw's Diadem while someone is inside?

So my thoughts are: Either the room can predict the future and knows that Harry will need the whistle, or it can change when someone is in the room. But in that case, there is no need for anyone to leave to retrieve the diadem.

Does anyone understand what I'm trying to say?

EDIT: This question did not provide the answer I am looking for.

  • Interesting idea. I suppose (and I imagine this is the correct answer) that you can simply hand-wave the problem away by saying a whistle is a small thing, whereas a full room change is a much bigger task. Could also be a safety thing - if you're standing where a solid object is in another version of the room when it changes... – DavidS Nov 3 '15 at 16:39
  • But you don't need to wish for whole room to change, just for diadem to come over :D – Vanja Vasiljevic Nov 3 '15 at 16:49
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    The diadem is a real object, though. I doubt the room has any power over it. I always imagined stuff in the Room to be like leprechauns gold, or the Holodeck - remove the whistle from the room and it'll fade away since it's not actually real. – DavidS Nov 3 '15 at 16:52
  • I never thought about stuff in room like Leprechaun gold... That would be perfect... But it did make path to Hog's Head, and where does the room stops and tavern begins? – Vanja Vasiljevic Nov 3 '15 at 17:04
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The answers are pretty much found in The Deathly Hallows, The Lost Diadem chapter.

The room needs to be empty of a person in order to completely change. Or, rather, to allow the room to be reset.

However, the room doesn't need to be empty in order to change for the people already inside of it. They just need to be specific with what they'd like the room to be.

So, it doesn't need to predict the future, it just needs to detect a strong, specific desire in order to create something. Harry's whistle on the shelf was created the same way Neville made a door to Hog's Head, and how the DA expanded the room.

The relevant section of the book:

 ‘Where are we?’

 ‘Room of Requirement, of course!’ said Neville. ‘Surpassed itself, hasn’t it? The Carrows were chasing me, and I knew I had just one chance for a hideout: I managed to get through the door and this is what I found! Well, it wasn’t exactly like this when I arrived, it was a load smaller, there was only one hammock and just Gryffindor hangings. But it’s expanded as more and more of the DA have arrived.’

 ‘And the Carrows can’t get in?’ asked Harry, looking around for the door.

 ‘No,’ said Seamus Finnigan, whom Harry had not recognised until he spoke: Seamus’s face was bruised and puffy. ‘It’s a proper hideout, as long as one of us stays in here, they can’t get at us, the door won’t open. It’s all down to Neville. He really gets this Room.

 You’ve got to ask it for exactly what you need – like, “I don’t want any Carrow supporters to be able to get in” – and it’ll do it for you! You’ve just got to make sure you close the loopholes! Neville’s the man!’

 ‘It’s quite straightforward, really,’ said Neville modestly. ‘I’d been in here about a day and a half, and getting really hungry, and wishing I could get something to eat, and that’s when the passage to the Hog’s Head opened up. I went through it and met Aberforth. He’s been providing us with food, because for some reason, that’s the one thing the Room doesn’t really do.’

  • Than why Harry didn't just thought with strong, specific desire about diadem? Than diadem would appear if desire was only thing it needs.. He didn't have to ask for whole Room of Hidden things, just one diadem. – Vanja Vasiljevic Nov 3 '15 at 16:52
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    @VanjaVasiljevic Because the Diadem was a real object, placed in the Room, not a creation of the Room itself. The Diadem was stored in a version of the Room that appears when people want to hide something. We don't have any evidence that the room can control things not created by the room itself. – user31178 Nov 3 '15 at 16:57
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    That room is full of mysteries, how the hell did it make path to Hog's Head if it cant control things that are not created by the room – Vanja Vasiljevic Nov 3 '15 at 17:07
  • @VanjaVasiljevic It created a door... that led to Hog's Head. I think what you're asking is its own question, though. My guess is that it's more than the RoR can only cast a specific type of transfiguration magic, and summoning isn't part of it. – user31178 Nov 3 '15 at 17:11
  • as I said, that room is crazy :) but thanks for our answer :) – Vanja Vasiljevic Nov 3 '15 at 17:16
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This is a guess, but I am going to run with it. The diadem was cursed and therefore couldn't be simply conjured. So the room of requirement needed to bring the room of hidden things to the door so that Harry could look for it manually.

And/or the room of requirement behaves similarly to Accio in that it can conjure up things that the witch or wizard clearly knows, but not things he knows general existence of.

  • How did the Room hid it in first place than? :D – Vanja Vasiljevic Nov 3 '15 at 16:53
  • Have you heard of the expression FnM? – Escoce Nov 3 '15 at 16:54
  • No, I have not.. – Vanja Vasiljevic Nov 3 '15 at 16:55
  • The last letter stands for Magic – Escoce Nov 3 '15 at 16:56

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