Permutation City

I trust you’ll understand, and I'm confident that you'll accept the situation with dignity and equanimity.

Best wishes,

Paul

He sank to his knees, still holding the note, staring at it with disbelief. I can't have done this. I can't have been so callous.

No?

He could never have done it to anyone else. He was sure of that. He wasn't a monster, a torturer, a sadist.

And he would never have gone ahead himself without the bale-out option as a last resort. Between his ludicrous fantasies of stoicism, and the sanity-preserving cop-out of relating only to the flesh-and-blood version, he must have had moments of clarity when the bottom line had been: If it's that bad, I can always put an end to it.

But as for making a Copy, and then -- once its future was no 'longer his future, no longer anything for him to fear -- taking away its power to escape . . . and rationalizing this hijacking as nothing more than an over-literal act of self-control . . .

It rang so true that he hung his head in shame.

Then he dropped the note, raised his head, and bellowed with all the strength in his non-existent lungs: "DURHAM! YOU PRICK!"

+ + +

Paul thought about smashing furniture. Instead, he took a long, hot shower. In part, to calm himself; in part, as an act of petty vengeance: twenty virtual minutes of gratuitous hydrodynamic calculations would annoy the cheapskate no end. He scrutinized the droplets and rivulets of water on his skin, searching for some small but visible anomaly at the boundary between his body -- computed down to subcellular resolution -- and the rest of the simulation, which was modelled much more crudely. If there were any discrepancies, though, they were too subtle to detect.

He dressed, and ate a late breakfast, shrugging off the surrender to normality. What was he meant to do? Go on a hunger strike? Walk around naked, smeared in excrement? He was ravenous, having fasted before the scan, and the kitchen was stocked with a -- literally -- inexhaustible supply of provisions. The muesli tasted exactly like muesli, the toast exactly like toast, but he knew there was a certain amount of cheating going on with both taste and aroma. The detailed effects of chewing, and the actions of saliva, were being faked from a patchwork of empirical rules, not generated from first principles; there were no individual molecules being dissolved from the food and torn apart by enzymes -- just a rough set of evolving nutrient concentration values, associated with each microscopic "parcel" of saliva. Eventually, these would lead to plausible increases in the concentrations of amino acids, various carbohydrates, and other substances all the way down to humble sodium and chloride ions, in similar "parcels" of gastric juices . . . which in turn would act as input data to the models of his intestinal villus cells. From there, into the bloodstream.

Urine and feces production were optional -- some Copies wished to retain every possible aspect of corporeal life -- but Paul had chosen to do without. (So much for smearing himself in excrement.) His bodily wastes would be magicked out of existence long before reaching bladder or bowel. Ignored out of existence; passively annihilated. All that it took to destroy something, here, was to fail to keep track of it.

Coffee made him feel alert, but also slightly detached -- as always. Neurons were modeled in the greatest detail, and whatever receptors to caffeine and its metabolites had been present on each individual neuron in his original's brain at the time of the scan, his own model-of-a-brain incorporated every one of them -- in a simplified, but functionally equivalent, form.

And the physical reality behind it all? A cubic meter of silent, motionless optical crystal, configured as a cluster of over a billion individual processors, one of a few hundred identical units in a basement vault . . . somewhere on the planet. Paul didn't even know what city he was in; the scan had been made in Sydney, but the model's implementation would have been contracted out by the local node to the lowest bidder at the time.

He took a sharp vegetable knife from the kitchen drawer, and made a shallow cut across his left forearm. He flicked a few drops of blood onto the sink -- and wondered exactly which software was now responsible for the stuff. Would the blood cells die off slowly -- or had they already been surren-dered to the extrasomatic general-physics model, far too unsophisticated to represent them, let alone keep them "alive"?