After seeing this question and some of the discussion on it got me wondering if this pair of Vanishing Cabinets was common or rare...

How did Dumbledore not know that the Vanishing Cabinet was one of a pair?

We know that Draco had to repair the cabinets after he realized there was a connection.

The other’s in Borgin and Burkes, said Malfoy, and they make a kind of passage between them. […] I was the only one who realised what it meant – even Borgin didn’t know – I was the one who realised there could be a way into Hogwarts through the Cabinets if I fixed the broken one.' - Harry Potter and the Halfblood Prince, ch. 27 ‘The Lightning-Struck Tower’

Then from the films we have this scene Mr. Weasley's Information

You can see the appeal, should the Death Eaters come knocking, on would simply slip inside and disappear for an hour or two. Could transport you practically anywhere. Tricky contraptions though, very temperamental. - Harry Potter and the Half-Blood Prince (film)

Dumbledore lead Draco to believe this was a very clever idea, and one that even Dumbledore did not think of:

Dumbledore’s sigh was half a groan. He closed his eyes for a moment. ‘That was clever… there is a pair, I take it?

‘Very good,’ murmured Dumbledore. ‘So the Death Eaters were able to pass from Borgin and Burkes into the school to help you… a clever plan, a very clever plan… and, as you say, right under my nose…”

However, my recollection of the story line was that Dumbledore essentially allowed Draco to carry out his plan. Dumbledore knew Snape had made an Unbreakable Vow with Draco and encouraged Snape directly help Draco. In the tower scene Dumbledore is just stalling and trying to get in Draco's head so that Snape will have have to be the one to finish the job.

Regardless of whether Dumbledore knew the cabinets were a pair or not, do we know if Vanishing Cabinets were produced as pairs or as stand-alone items or was the identical pair we see unique?

  • Based on the fact that the two vanishing cabinets are identical, it would seem that they're matched pairs. – Valorum May 2 '16 at 13:03
  • @Richard Yes, for that pair. Does that make them unique though? I am asking about the Cabinets in a more general sense as we see in the line from Mr. Weasley, they were at least moderately used/produced. – Skooba May 2 '16 at 13:08
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    the fact that line comes from the film, makes me dis-regard it completely as trash. since the films were trash. – Himarm May 2 '16 at 13:46
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    Dumbledore essentially allowed and supported Draco’s attempt to kill him—not to let a dozen Death Eaters into the school. The Vanishing Cabinet trick was indeed right under Dumbledore’s nose, and I'm pretty sure he would have tried to stop it if he'd known about it. Risking his own life is one thing; risking the lives of students quite another. – Janus Bahs Jacquet May 3 '16 at 7:30
  • For some reason the cabinets remind me of "Kamui" in Naruto. The eye technique provides access to another dimension accesible only to the user. Problem is Ninjas can easily transplant eyes so if someone steals it he has access to the same dimension. I always assumed vanishing cabinets also worked like this. they would put you in a hidden dimension, what Draco solved was how to use another gateway to get back into our dimension – Arcane Dec 6 '16 at 2:59

Based on the exchange between Dumbledore and Malfoy, I find it rather more likely that they do not generally come in pairs. Whether or not the pair at Hogwarts and at Borgin & Burke's is unique, I cannot say, but they certainly appear to be an unusual case.

You point out in your question that Dumbledore seems surprised that there is a pair, but you are justified in doubting whether Dumbledore is simply being deceitful and stalling for time. But look at Draco's response:

"That was clever. . . . There is a pair, I take it?"

"In Borgin and Burkes,” said Malfoy, "and they make a kind of passage between them." (from Half-Blood Prince, Chapter 27)

Why would Malfoy feel the need to explain this if it were common knowledge? Malfoy, having grown up in a wealthy pureblood family, is very familiar with the workings of the wizarding world and must assume Dumbledore is as well; he would hardly feel the need to explain that one could travel between two Vanishing Cabinets, much less use such uncertain words as "kind of" to describe it, if not for the fact that Vanishing Cabinets do not generally have this feature.

Another reason why I suspect it is unusual for Vanishing Cabinets to come in pairs is that otherwise, the staff would certainly not allow the Vanishing Cabinet to remain at Hogwarts. Sure, Dumbledore and Snape might have had their own reasons for not interfering with Draco's attempts, but what had happened to Montague meant that the presence of the Cabinet in the school was common knowledge. Surely someone in the staff -- Filch, perhaps -- would have done something about it if Vanishing Cabinets tended to come in pairs.

There is, of course, an alternative explanation: disregarding the line in the movie, it could be the case that the two Vanishing Cabinets are in fact the only ones in existence. This would explain the words of Draco and Dumbledore and the actions of the staff just as well. In any case the existence of a pair of connected Vanishing Cabinets is unusual.

  • I agree with your last explanation, from the way the first cabinet is described when Montague disapears in it, it seems to be a unique (or nearly) object, a vanishing cabinet like there are moving stairs, Hogwarts curiosities, but not a common thing at all. The fact that Dumbledore immediately thinks there's a pair only comes down to his high intelligence and understanding of the deep laws of magic (if Malfoy managed to find a fixed point of exit for the vanished object, it must be the same magic, thus another cabinet that you can link). – Cartolin Dec 6 '16 at 10:20

From how I understood the concept of the vanishing cabinets, I believe that the cabinets came as a pair, and were used as a means of transportation e.g. as a means to escape Deatheaters. However over time, and due to to destruction of most cabinets, they fell out of use, resulting in only single vanishing cabinets being left.

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