The nearby air was full of travelers, some riding bikes, some on prop-driven contraptions powered by pedals, and some kicking their feet to flap huge white wings strapped to their backs. They carried parcels, towed cargos, and in the case of the fan-jets, left behind slowly fading arcs and lines of white contrail to match the sky.
Their cylindrical frigate had emerged from the clouds near Slip-stream's sun, which it made an inferno of half the sky. Seconds out of the mist and the temperature was already rising in the normally chilly ship's lounge. The other boys were pointing at something and shouting excitedly; Hayden peered in that direction, trying to make out what was casting a seemingly impossible shadow across an entire half of the view. The vast shape was irregular like any of the rocks they had passed on their way here. Where those rocks were usually house-sized and sprouted spidery trees in all directions, this shape was blued with distance and covered with an even carpet of green. It took Hayden a few seconds to realize that it really was a rock, but one that was several miles in diameter.
He gaped at it. Father laughed from the dining basket, woven of wicker, where he perched with Mother. "That's the biggest thing you've ever seen, Hayden. But listen, there's much bigger places. Slipstream is not a major state. Remember mat."
"Is that Rush?" Hayden pointed.
Father pulled himself out of the basket and came over. With his broad laborer's shoulders and calloused hands, he bulked much bigger than the kids, who made a place for him next to Hayden. "The asteroid? That's not Rush. It's the source of Slipstream's wealth, thoughit and their sun." He leaned on the rail and pointed. "No That is Rush."
Maybe it was because he'd never seen anything like it before, but the city simply hadn't registered in Hayden's mind until this moment. After all, the towns of Aerie were seldom more than two hundred yards across, and were simply wheels made of wooden planks lashed together and spoked with rope. You spun up the whole assembly and built houses on the inside surface of the wheel. Simple. And never had he seen more than five or six such wheels in one place.
The dozens of towns that made up Rush gleamed of highly polished metal. They were more cylindrical than ring-shaped, and none was less than five hundred yards in diameter. The most amazing tiling was that they were tethered to the forested asteroid in quartets like mobiles; radiating from each cylinder's outer rim were bright sails of gold and red that transformed them from there towns into gorgeous pinwheels.
"The asteroid's too big to be affected by the wind," said Father. Hayden shifted uncomfortably; Father was not trying to hide the burr of his provincial Aerie accent. "The towns are small enough to get pulled around by gusts. They use the sails to help keep the wheels spun up." This made sense to Hayden, because wind was the result of your moving at a different speed than whatever airmass you were in. Most of the time, objects migrated outward and inward in Virga to the rhythm of slowly circulating rivers of air. You normally only experienced wind at the walls of a town or while flying. Many times,
he had folded little propellers of paper and let them out on strings. They'd twirled in the rushing air. So did the towns of Rush, only much more slowly.
Hayden frowned. "If that big rock isn't moving with the air, won't it drift away from the rest of Slipstream?"
"You've hit on the very problem," said Father with a smile. "Slipstream's more migratory than most countries. The Slipstreamers have to follow their asteroid's orbit within Virga. You can't see from here, but their sun is also tethered to the asteroid. Ten years ago, Slipstream drifted right into Aerie. Before that, we were a smaller and less wealthy nation, being far from the major suns. But we were proud. We controlled our own destiny. Now what are we? Nothing but vassals of Rush."
Hayden barely heard him. He was eagerly staring at the city.
Their ship arrived at midday to find a traffic jam at the axis of one of the biggest cylinders. It took an hour to disembark, but Hayden didn't care. He spent the time watching the heavily built-up inner surface of the town revolve past. He was looking for places to visit. From the axis of the cylinder, where the docks sat like a jumble of big wooden dice, cable-ways radiated away to the other towns that made up the city. One wheel in particular caught his eyea huge cylinder whose inside seemed to be one single building with balconies, coigns and glittering glass-paneled windows festooning it. This cylinder was surrounded by warships, which Hayden had seen in photos but never been close to before. The massive wooden vessels bristled with gun ports, and they trailed smoke and ropes and masts like the spines of fish. They were majestic and fascinating.
"You'll never get there," said Father dryly. "That's the pilot's palace."
After ages they were finally able to descend the long, curving, covered stairway to the street. Here Hayden had to endure another interminable wait while a man in a uniform examined Father's papers. Hayden was too distracted at the time to really notice his father's falsely jovial manner, or the way his shoulders had slumped with relief when they were finally accepted into the city. But after some walking he turned to Mother and kissed her, saying quietly, "I'll be back soon. Check us into the hotel, but don't wait for me. Go and do some shopping, it'll take your mind off it."