David Langford - Different Kinds of Darkness

It was always dark outside the windows. Parents and teachers sometimes said vaguely that this was all because of Deep Green terrorists, but Jonathan thought there was more to the story. The other members of the Shudder Club agreed.

The dark beyond the window-glass at home, at school and on the school bus was the second kind of darkness. You could often see a little bit in the first kind, the ordinary kind, and of course you could slice through it with a torch. The second sort of darkness was utter black, and not even the brightest electric torch showed a visible beam or lit anything up. Whenever Jonathan watched his friends walk out through the school door ahead of him, it was as though they stepped into a solid black wall. But when he followed them and felt blindly along the handrail to where the homeward bus would be waiting, there was nothing around him but empty air. Black air.

Sometimes you found these super-dark places indoors. Right now Jonathan was edging his way down a black corridor, one of the school's no-go areas. Officially he was supposed to be outside, mucking around for a break period in the high-walled playground where (oddly enough) it wasn't dark at all and you could see the sky overhead. Of course, outdoors was no place for the dread secret initiations of the Shudder Club.

Jonathan stepped out on the far side of the corridor's inky-dark section, and quietly opened the door of the little storeroom they'd found two terms ago. Inside, the air was warm, dusty and stale. A bare light-bulb hung from the ceiling. The others were already there, sitting on boxes of paper and stacks of battered textbooks.

'You're late,' chorused Gary, Julie and Khalid. The new candidate Heather just pushed back long blonde hair and smiled, a slightly strained smile.

'Someone has to be last,' said Jonathan. The words had become part of the ritual, like a secret password that proved that the last one to arrive wasn't an outsider or a spy. Of course they all knew each other, but imagine a spy who was a master of disguise

Khalid solemnly held up an innocent-looking ring-binder. That was his privilege. The Club had been his idea, after he'd found the bogey picture that someone had left behind in the school photocopier. Maybe he'd read too many stories about ordeals and secret initiations. When you'd stumbled on such a splendid ordeal, you simply had to invent a secret society to use it.

'We are the Shudder Club,' Khalid intoned. 'We are the ones who can take it. Twenty seconds.'

Jonathan's eyebrows went up. Twenty seconds was serious. Gary, the fat boy of the gang, just nodded and concentrated on his watch. Khalid opened the binder and stared at the thing inside. 'One two three'

He almost made it. It was past the seventeen-second mark when Khalid's hands started to twitch and shudder, and then his arms. He dropped the book, and Gary gave him a final count of eighteen. There was a pause while Khalid overcame the shakes and pulled himself together, and then they congratulated him on a new record.

Julie and Gary weren't feeling so ambitious, and opted for ten-second ordeals. They both got through, though by the count of ten she was terribly white in the face and he was sweating great drops. So Jonathan felt he had to say ten as well.

'You sure, Jon?' said Gary. 'Last time you were on eight. No need to push it today.'

Jonathan quoted the ritual words, 'We are the ones who can take it,' and took the ring-binder from Gary. 'Ten.'

In between times, you always forgot exactly what the bogey picture looked like. It always seemed new. It was an abstract black-and-white pattern, swirly and flickery like one of those old Op Art designs. The shape was almost pretty until the whole thing got into your head with a shock of connection like touching a high-voltage wire. It messed with your eyesight. It messed with your brain. Jonathan felt violent static behind his eyes an electrical storm raging somewhere in there instant fever singing through the blood muscles locking and unlocking and oh dear God had Gary only counted four?

He held on somehow, forcing himself to keep still when every part of him wanted to twitch in different directions. The dazzle of the bogey picture was fading behind a new kind of darkness, a shadow inside his eyes, and he knew with dreadful certainty that he was going to faint or be sick or both. He gave in and shut his eyes just as, unbelievably and after what had seemed like years, the count reached ten.

Jonathan felt too limp and drained to pay much attention as Heather came closebut not close enoughto the five seconds you needed to be a full member of the Club. She blotted her eyes with a violently trembling hand. She was sure she'd make it next time. And then Khalid closed the meeting with the quotation he'd found somewhere: 'That which does not kill us, makes us stronger.'

School was a place where mostly they taught you stuff that had nothing to do with the real world. Jonathan secretly reckoned that quadratic equations just didn't ever happen outside the classroom. So it came as a surprise to the Club when things started getting interesting in, of all places, a maths class.

Mr Whitcutt was quite old, somewhere between grandfather and retirement age, and didn't mind straying away from the official maths course once in a while. You had to lure him with the right kind of question. Little Harry Steenthe chess and wargames fanatic of the class, and under consideration for the Clubscored a brilliant success by asking about a news item he'd heard at home. It was something to do with 'mathwar', and terrorists using things called blits.

'I actually knew Vernon Berryman slightly,' said Mr Whitcutt, which didn't seem at all promising. But it got better. 'He's the B in blit, you know: B-L-I-T, the Berryman Logical Imaging Technique, as he called it. Very advanced mathematics. Over your heads, probably. Back in the first half of the twentieth century, two great mathematicians called Goedel and Turing proved theorems which um. Well, one way of looking at it is that mathematics is booby-trapped. For any computer at all, there are certain problems that will crash it and stop it dead.'

Half the class nodded knowingly. Their home-made computer programs so often did exactly that.

'Berryman was another brilliant man, and an incredible idiot. Right at the end of the twentieth century, he said to himself, What if there are problems that crash the human brain? And he went out and found one, and came up with his wretched imaging technique that makes it a problem you can't ignore. Just looking at a BLIT pattern, letting in through your optic nerves, can stop your brain.' A click of old, knotty fingers. 'Like that.'

Jonathan and the Club looked sidelong at each other. They knew something about staring at strange images. It was Harry, delighted to have stolen all this time from boring old trig., who stuck his hand up first. 'Er, did this Berryman look at his own pattern, then?'

Mr Whitcutt gave a gloomy nod. 'The story is that he did. By accident, and it killed him stone dead. It's ironic. For centuries, people had been writing ghost stories about things so awful that just looking at them makes you die of fright. And then a mathematician, working in the purest and most abstract of all the sciences, goes and brings the stories to life.'

He grumbled on about BLIT terrorists like the Deep Greens, who didn't need guns and explosivesjust a photocopier, or a stencil that let them spray deadly graffiti on walls. According to Whitcutt, TV broadcasts used to go out 'live', not taped, until the notorious activist Tee Zero broke into a BBC studio and showed the cameras a BLIT known as the Parrot. Millions had died. It wasn't safe to look at anything these days.