They had gathered, not around the board this time, but around a small device which, for reasons never discussed, appeared capable of producing lectures on demand.
Mr Blottisham leaned forward with enthusiasm.
“Now this,” he said, “is a man who understands the problem.”
Professor Quillibrace said nothing.
Miss Stray watched.
A voice filled the room.
It spoke of light.
Blottisham nodded vigorously throughout.
“There,” he said, as the voice paused. “Exactly as I’ve been saying.”
“You have not been saying that,” said Quillibrace.
Blottisham waved this aside. “The important point is that light is different. It doesn’t behave like other things. It doesn’t really move in the usual sense.”
Quillibrace turned slightly.
“That is correct,” he said. “And incorrectly understood.”
Blottisham frowned. “How can it be both?”
“Because the statement preserves the intuition,” said Quillibrace, “while retaining the structure that makes the intuition necessary.”
Stray spoke.
“He can see something failing,” she said. “But he still describes it as if it were working.”
Blottisham looked between them.
“He says the speed of light isn’t like other speeds,” he insisted. “That it’s something fundamentally different.”
“Yes,” said Quillibrace. “Because it is not a speed.”
Blottisham paused.
“Well then what is it?”
“A constraint,” said Quillibrace.
The device resumed.
Blottisham seized on this.
“There!” he said. “It travels—but no time passes. That’s the paradox.”
“There is no paradox,” said Quillibrace. “Only a contradiction you are attempting to maintain.”
Blottisham stared. “It leaves one point and arrives at another.”
“No,” said Quillibrace.
“It must—otherwise how does it get there?”
“It does not get anywhere.”
Blottisham turned to Stray.
“You see the difficulty.”
“I see the construction,” she said.
Blottisham gestured toward the device.
“He’s describing a path. Emission, propagation, absorption.”
“He is describing it,” said Stray. “Yes.”
“And you deny it?”
“I deny that the description corresponds to structure.”
Quillibrace spoke again.
“What is preserved,” he said, “is a relation between instantiations under constraint.”
Blottisham shook his head. “That’s not what he’s saying.”
“No,” said Quillibrace. “It is what makes what he is saying appear necessary.”
The voice continued, now speaking of frames of reference.
Blottisham smiled. “Now we’re on solid ground.”
“No,” said Quillibrace.
Blottisham sighed. “You’re going to remove observers as well, I suppose.”
“They were never added,” said Quillibrace.
Stray tilted her head.
“He needs them,” she said. “To hold the structure together.”
“But the structure does not require them,” said Quillibrace.
Blottisham leaned back.
“So let me understand this,” he said. “Light doesn’t move, time doesn’t pass, there are no frames, no observers—and yet something is still being described.”
“Yes,” said Quillibrace.
“And what is that?”
Quillibrace did not answer immediately.
Stray did.
“A limit,” she said. “On how the structure can be stabilised.”
Blottisham was quiet for a moment.
Then:
“And the statement that a photon experiences no time?”
Quillibrace allowed the faintest trace of approval.
“A compression,” he said. “Of a failure.”
Blottisham blinked. “A failure of what?”
Stray answered.
“A failure to construct time,” she said. “Under those constraints.”
Blottisham considered this.
“So time doesn’t stop,” he said slowly.
“No,” said Quillibrace.
“It just isn’t there.”
Quillibrace inclined his head slightly.
Blottisham looked back at the device.
“And he knows this?”
A pause.
Stray spoke carefully.
“He knows something is wrong with the usual picture,” she said. “He can feel where it breaks.”
“But he still describes it as if it were intact,” said Quillibrace.
Blottisham nodded slowly.
“So he’s right,” he said, “but not quite.”
Quillibrace turned back toward the empty board.
“He is precise,” he said, “within a structure that cannot sustain his precision.”
Blottisham frowned.
“That seems unfair.”
Stray smiled, just slightly.
“It’s inevitable,” she said.
The device fell silent.
Blottisham remained seated for a while.
Then, with some reluctance:
“So light doesn’t travel,” he said.
“No.”
“It doesn’t experience time.”
“No.”
“It doesn’t go from one place to another.”
“No.”
Blottisham looked up.
“Then why does it look so very much as if it does?”
This time, neither answered immediately.
At last, Quillibrace spoke.
“Because,” he said, “you insist on reading it that way.”
Stray added, almost gently:
“And because the structure allows you to.”
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