Slartibartfast touched a button and added, not entirely reassuringly. "It scares the willies out of me. Hold tight."
The car shot forward straight into the circle of light, and suddenly Arthur had a fairly clear idea of what infinity looked like.
It wasn't infinity in fact. Infinity itself looks flat and uninteresting. Looking up into the night sky is looking into infinity — distance is incomprehensible and therefore meaningless. The chamber into which the aircar emerged was anything but infinite, it was just very very big, so that it gave the impression of infinity far better than infinity itself.
Arthur's senses bobbed and span, as, travelling at the immense speed he knew the aircar attained, they climbed slowly through the open air leaving the gateway through which they had passed an invisible pinprick in the shimmering wall behind them.
The wall.
The wall defied the imagination — seduced it and defeated it. The wall was so paralysingly vast and sheer that its top, bottom and sides passed away beyond the reach of sight. The mere shock of vertigo could kill a man.
The wall appeared perfectly flat. It would take the finest laser measuring equipment to detect that as it climbed, apparently to infinity, as it dropped dizzily away, as it planed out to either side, it also curved. It met itself again thirteen light seconds away. In other words the wall formed the inside of a hollow sphere, a sphere over three million miles across and flooded with unimaginable light.
"Welcome," said Slartibartfast as the tiny speck that was the aircar, travelling now at three times the speed of sound, crept imperceptibly forward into the mindboggling space, "welcome," he said, "to our factory floor."
Arthur stared about him in a kind of wonderful horror. Ranged away before them, at distances he could neither judge nor even guess at, were a series of curious suspensions, delicate traceries of metal and light hung about shadowy spherical shapes that hung in the space.
"This," said Slartibartfast, "is where we make most of our planets you see."
"You mean," said Arthur, trying to form the words, "you mean you're starting it all up again now?"
"No no, good heavens no," exclaimed the old man, "no, the Galaxy isn't nearly rich enough to support us yet. No, we've been awakened to perform just one extraordinary commission for very ... special clients from another dimension. It may interest you ... there in the distance in front of us."
Arthur followed the old man's finger, till he was able to pick out the floating structure he was pointing out. It was indeed the only one of the many structures that betrayed any sign of activity about it, though this was more a sublimal impression than anything one could put one's finger on.
At the moment however a flash of light arced through the structure and revealed in stark relief the patterns that were formed on the dark sphere within. Patterns that Arthur knew, rough blobby shapes that were as familiar to him as the shapes of words, part of the furniture of his mind. For a few seconds he sat in stunned silence as the images rushed around his mind and tried to find somewhere to settle down and make sense.
Part of his brain told him that he knew perfectly well what he was looking at and what the shapes represented whilst another quite sensibly refused to countenance the idea and abdicated responsibility for any further thinking in that direction.
The flash came again, and this time there could be no doubt.
"The Earth ..." whispered Arthur.