Chapter 267: Spatial Transfiguration Means Twisting Heads [bonus]
Monday morning.
Transfiguration. Third period.
Professor McGonagall stood at the front of the classroom with the particular kind of stillness that meant she was about to say something that would ruin someone's week.
"Spatial Transfiguration," she said, and wrote the words on the board in precise, unforgiving chalk. "The modification of dimensional relationships between objects without altering their physical substance."
She turned to face the class.
"You will not be tested on this until fifth year. You will not be expected to perform it until sixth. I am teaching it now because several of you have developed habits of thinking about Transfiguration in ways that will become problems later, and it is easier to correct a bad habit early than to undo it after it has calcified."
Her eyes moved across the room.
They paused, briefly, on Regulus.
He didn't react. He was already looking at the board.
The theory took forty minutes.
Most of the class took notes in the mechanical way of students who understood that something was being explained but not yet why it mattered. Scratching quills, occasional furrowed brows, the soft sound of someone flipping back through their parchment to check a definition.
Spatial Transfiguration, McGonagall explained, was not about making something larger or smaller. That was Scale Transfiguration. That was simple.
Spatial Transfiguration was about changing where the interior of something was in relation to its exterior.
A box with the inside of a room. A pocket with the inside of a warehouse. A corridor with the inside of a cathedral.
The exterior remained exactly what it was. The interior was somewhere else entirely.
"The difficult part," McGonagall said, "is not the casting. It is the understanding. You must hold two spatial realities in your mind simultaneously and believe, completely, that both are true. The exterior is here. The interior is there. Neither is lying to you. Both exist."
She picked up a small wooden cube from her desk.
"The common failure mode is attempting to reconcile them. The mind insists on consistency. It wants the inside to match the outside. Students who fail at Spatial Transfiguration do not fail because they lack power or precision. They fail because they cannot stop trying to make sense of something that does not, by ordinary logic, make sense."
She set the cube down.
"This is why I teach it early. Not so you can do it. So you can begin, now, building the mental habit of holding contradictions without resolving them."
A hand went up near the back. A Gryffindor boy, Pettigrew, who always looked slightly startled by his own questions.
"But — if the inside is somewhere else — where is the inside? Physically?"
"An excellent question," McGonagall said, in a tone that suggested she had answered it many times before and would answer it many times more. "The interior exists in a folded spatial pocket anchored to the exterior object. It is not elsewhere in the conventional sense. It is adjacent to ordinary space in a direction that does not have a name in any spoken language."
Pettigrew wrote that down with the expression of someone who had understood none of it but intended to think about it later.
The practical portion of the class was not, in fact, practical.
McGonagall distributed small sealed boxes — smooth, featureless wood, no larger than a fist — and told them to hold the box in both hands and think.
"Do not attempt a spell. Do not reach for your wand. Simply hold the box and attempt to perceive it in two ways simultaneously. As an object with an interior consistent with its exterior. And as an object whose interior could be anywhere."
She paused.
"This will feel like nothing is happening. That is correct. You are building a neural pathway, not casting a spell. The feeling of nothing happening is the work."
She walked between the rows.
Regulus held his box.
It was lighter than it looked. Probably hollow.
He turned it over once in his hands, then set it flat on the desk and looked at it.
The interior is here. The interior is somewhere else.
He had read about Spatial Transfiguration before. Not in the third-year syllabus. In his family's library, in a book that had sat on a high shelf in his father's study, spine cracked with old use. He had read it at eleven, understood perhaps a third of it, and thought about it periodically since.
The theory wasn't the hard part. McGonagall was right about that.
The hard part was the moment the mind pushed back.
He felt it now. A kind of cognitive friction. The box was a box. It had an inside. The inside was inside the box. That was what inside meant.
He let that thought arise and pass without fighting it.
Both are true. Neither is lying.
McGonagall paused beside his desk for a moment. He didn't look up. She moved on.
Across the aisle, Lina was holding her box with both hands, eyes closed. Her brow was furrowed slightly. Not frustrated. Focused in a way that looked almost like sleep.
Samuel, one row back, was rotating his box slowly in his fingers, staring at it from different angles with an expression of polite confusion.
He turned it over again.
McGonagall, at the front of the room, observed her students the way she always did during early-stage theory work.
Most of them were doing it correctly, which meant they were sitting quietly with their boxes and experiencing a low-grade sensation of futility. That was correct. That was the point.
A few were not.
One Gryffindor in the second row was holding his box up to the light as if he expected to see through it. She made a note to address that.
One Slytherin near the back had already put his box down and appeared to be sketching something in his notebook. She would address that more firmly.
And then there was Black.
She had been watching him intermittently since the start of the practical.
He wasn't doing anything visually distinctive. Box on desk, hands flat on either side of it, head slightly bowed. The same as a dozen other students.
But there was something about the quality of his stillness.
She had taught long enough to know the difference between a student who was sitting quietly and a student who was actually doing the work. Stillness looked the same from the outside. It felt different from the same room.
She didn't interfere. She walked her usual path between the rows, correcting posture, redirecting wandering attention, answering quiet questions.
At the end of the period, she collected the boxes.
"This week," she said, "you will write two inches on the philosophical distinction between location and containment. Not the magical distinction. The philosophical one. I want to see evidence that you have thought about this, not that you have copied it from a reference text."
The bell rang.
Students began to move.
"Black."
He stopped.
The room cleared around him. The door closed.
McGonagall stood at her desk, straightening a stack of parchment. She didn't look at him immediately.
"Sit down."
He sat. Not the front row — one back, on the aisle. Relaxed, not casual. The difference was small but she had learned to read it.
She set the parchment aside. Looked at him.
"Did anything happen during the practical?"
He met her eyes. "The friction passed sooner than I expected."
She studied him. "Explain."
"The resistance," he said. "When the mind pushes back against holding contradictory spatial truths. It came, and then it —" he paused, choosing the word with care "— resolved. Not into one or the other. Just into both. Simultaneously."
"How long did that take?"
"Four minutes, approximately. Maybe five."
McGonagall was quiet for a moment.
Most students, attempting this exercise for the first time, either felt nothing at all or felt the resistance and stopped there. The resolution — the actual experience of holding two spatial truths without the mind collapsing one into the other — typically took weeks of practice before it happened organically.
She knew of second-years who had first encountered this exercise.
She knew of seventh-years who had never experienced it.
"You've read ahead," she said. It wasn't an accusation.
"My family has relevant materials."
"Black family library."
"Yes."
She folded her hands on the desk. "And what did those materials tell you about the resolution state?"
"That it can't be forced," he said. "That trying to force it is why most people fail. That the correct approach is to hold both truths lightly and wait for the mind to stop treating the contradiction as a problem." A brief pause. "The book described it as 'ceasing to demand that reality justify itself to you.'"
"That is a reasonable description." She looked at him steadily. "What year was that book?"
"Fourteen forty-two. Hand-copied."
She didn't visibly react. Fourteen forty-two meant pre-standardization. That was advanced theory even by modern research standards. The casual way he mentioned it told her what she had already suspected about how he had been raised.
Not crammed. Surrounded.
There was a difference.
"The essay requirement stands," she said. "Two inches. Philosophical distinction, not magical."
"Understood."
"You may want to write more than two inches."
He looked at her. Something shifted in his expression — not surprise, exactly. Recognition.
"I usually do," he said.
She unfolded her hands. "That's all."
He stood, picked up his bag, and left.
McGonagall turned back to her desk.
Spatial Transfiguration. The modification of dimensional relationships. The capacity to hold two truths simultaneously without demanding that they reconcile.
She had taught this exercise for nineteen years.
The number of students who had experienced the resolution state in their first session she could count on one hand.
She picked up her quill.
He is going to be a problem, she thought, in the most interesting sense of the word.
Outside in the corridor, Regulus fell into step with Lina and Samuel.
Samuel looked at him.
"McGonagall kept you back."
"She asked about the exercise."
"And?"
"And nothing." Regulus shifted his bag to the other shoulder. "She wanted to know what I noticed."
Samuel accepted this without pushing. He had learned, over the past months, that and nothing from Regulus meant the conversation had reached its natural end, not that he was hiding something. Usually.
Lina, walking on Regulus's other side, hadn't said anything yet.
She had her box in her hand still — she'd forgotten to return it, or more likely simply hadn't let go. She was turning it over slowly as she walked.
"I felt something," she said. Not to either of them specifically. "Near the end. Like — the box stopped being confusing. Just for a second."
"That's it," Regulus said.
She looked at him. "That's what?"
"That's the thing she was teaching."
Lina looked back at the box. Turned it over once more.
"It felt like nothing," she said.
"Yes," Regulus agreed. "That's what it feels like."
Samuel watched both of them with the expression of someone who had genuinely not experienced any of this and was beginning to wonder if there was something structurally different about his brain.
"I just kept thinking about what's actually inside the box," he said.
"What did you decide?"
"Nothing. It's sealed. I couldn't tell."
Regulus said nothing. But the corner of his mouth moved.
Samuel looked at it suspiciously.
"...Are you laughing at me?"
"I'm acknowledging the irony."
"What irony."
"You spent the entire exercise trying to figure out what was actually inside. The exercise was about learning to stop needing to know."
Samuel stared at him for a long moment.
"That," he said finally, "is a very annoying thing to say."
"Yes," Regulus agreed pleasantly.
They turned the corner toward the Great Hall.
Behind them, from somewhere in the corridor they had just left, there was the distant sound of a door and footsteps that paused, and then deliberately went another way.
Regulus didn't turn around.
He already knew who it was.
At dinner that evening, in the far corner of the Slytherin table, Rabastan sat with two of his usual companions and said very little.
He was thinking about Veritaserum.
Not about whether to buy the ingredients. He had already decided that.
He was thinking about what he would do with the information once he had it.
Black's secrets. Whatever they were. Whatever Samuel and Lina were protecting.
He thought about Bellatrix, and then stopped thinking about Bellatrix, because that line of thought led nowhere useful.
He thought about standing in the corridor junction and Snape reporting back to him with nothing new.
He thought about the fact that he had sent a half-blood to do his surveillance and the half-blood had come back empty-handed.
He thought about the fact that Avery's second-year had warned Snape off.
He thought about what it meant that a second-year had been assigned to watch over a third-year's watchers.
There was a structure here he wasn't quite seeing.
He pulled at the thread of it, the way he did when something didn't quite fit.
Black had assigned watchers. Black had known Rabastan would send someone. Black had prepared for it.
Which meant Black had known Rabastan was a problem before Rabastan had made any visible move.
Rabastan set down his fork.
How?
He turned it over.
He hadn't said anything to anyone. He'd kept this entirely to himself. Rabastan Lestrange, careful and discreet, who told no one his plans—
He stopped.
He thought about who had told him about Samuel and Lina. Who had pointed him toward them as something interesting. Who had made the initial observation that they looked like they were hiding something.
He thought about that conversation.
And then he thought about what Snape had said, flatly, without inflection:
Those two belong to Black. Cross them, and you pay for it.
He sat very still for a moment.
Then he picked up his fork again and continued eating.
The vegetables had gone cold.
He ate them anyway.
He was going to need to think about this much more carefully.
The chapter threads the title's double meaning — Spatial Transfiguration as the literal classroom content, and "twisting heads" as what's happening to Rabastan at the end as he begins to realize the entire situation may have been arranged for him. McGonagall's scene establishes Regulus's exceptional ability without making it feel unearned, and the trio's hallway exchange shows the dynamic between the three naturally.