Brain Room

"The place was quite empty except for a few desks and, in the very middle of the room, and enormous glass tank of deep-green water, big enough for all of them to swim in, which contained a number of pearly white objects that were drifting around lazily in the liquid"

- Description of the Thought Chamber from Harry Potter's point of view The Thought Chamber is a room in the Department of Mysteries. It is located on the ninth level of the Ministry of Magic in London, England. The room is devoted to the concept of thought and the mind.

Description
This chamber is long and rectangular, lit by low-hanging lamps. It contains a tank of encephala, or brains, that swim in a green solution. These particular brains are highly aggressive and will attack and constrict anything that tries to touch them or pick them up, as was the case with Ron Weasley. The tendrils that the brains possess are implied to be physical manifestations of thoughts.|[2] The concept of thought and all related subjects are studied in this chamber.

History
In 1996, part of a battle of the Second Wizarding War was fought in the Thought Chamber after Harry Potter, Hermione Granger, Ron and Ginny Weasley, Neville Longbottom, and Luna Lovegood arrived in the Department of Mysteries in search of Sirius Black. The six Dumbledore's Army members passed through the chamber upon their arrival; with Hermione pointing out that there were brains in the tank, and the students eventually deciding to flee from the room to get to the room they wanted to go to. The students were ambushed by Death Eaters in the Hall of Prophecy, and ended up fleeing through multiple chambers in the Department.

Ron Weasley got hit by a spell earlier that made his brain fuzzy and act rather drunken and stupid, and so he foolishly summonded a brain out of the tank. The brain burst from the liquid, and as it spun toward Ron, what looked like ribbons of moving images flew from it "unraveling like rolls of film". These were thoughts from the brain, and the moment they made conent with his skin the tentacles began wrapping themselves around Ron's arms like ropes and suffocating him.

Luckily, after the battle was over, Madam Pompfrey was able to heal Ron and no lasting damage was done to him, but he still had the scars from the tendrils of thought that coiled around him when he touched to brain.

Appearances

 * Harry Potter and the Order of the Phoenix
 * Harry Potter and the Order of the Phoenix (film)
 * Harry Potter and the Order of the Phoenix (video game)
 * Harry Potter and the Deathly Hallows: Part 2