Further along, there were small cases containing artifacts from outside the City. Ito touched her arm. "Perhaps you'll recognize some of this." There were spears and knives, all carved from wood; she saw nets, ponchos, lengths of rope.

Upfluxer artifacts.

None of them looked as if they had come from the Human Beings themselves. But, said Ito, that wasn't so surprising; there were upfluxer bands all around the fringe of Parz's hinterland, right around the Star's Polar cap. Dura studied the objects, aware of her own knife, her rope still wrapped around her waist. The things she carried wouldn't be out of place inside one of these displays, she realized. With a tinge of bitterness, she wondered if these people would like to pin her and her brother up on the walls, like that poor, dead ray.

Finally, Ito brought her to the Museum's most famous exhibit (she said). They entered a spherical room perhaps a dozen mansheights across. The light here was dim, coming only from a few masked wood-lamps, and it took some time for Dura's eyes to adapt to the darkness.

At first she thought there was nothing here, that the chamber was empty. Then, slowly, as if emerging from mist, an object took shape before her. It was a cloud about a mansheight across, a mesh of some shining substance. Ito encouraged her to move a little closer, to push her face closer to the surface of the mesh. The exhibit was like a tangled-up net, composed of cells perhaps a handsbreadth across. And Dura saw that within the cells of the main mesh there was more detail: sub-meshes, composed of fine cells no wider than a hair-tube. Perhaps, Dura wondered, if she could see well enough she would find still more cells, almost invisibly tiny, within the hair-scale mesh.

Ito showed Dura a plaque on the wall, inscribed with text on the display. " 'The structure is fractal.' " Ito pronounced the word carefully. " 'That is, it shows a similar structure on many scales. Corestuff lends itself to this property, being composed of hyperons, bags of quarks in which are dissolved the orderly nucleons — the protons and neutrons — of the human world.

" 'In regions humans can inhabit Corestuff exists in large metastable islands of matter — the familiar Corestuff bergs retrieved by Fishermen, and used to construct anchor-bands, among other artifacts...

" 'But further in, in the deep Core, the hyperonic material can combine to form extraordinary, rich structures like this model. The representation here is based on guesswork — on fragmentary tales from the time of the Core Wars, and on half-coherent accounts of Fishermen. Nevertheless, the University scholars feel that...' "

"But," Dura interrupted, "what is it?"

Ito turned to her, her face round and smooth in the dim light. "Why, it's a Colonist," she said.

"But the Colonists were human."

"No," Ito said. "Not really. They abandoned us, stealing our machines, and went down into the Core." She looked somber. "And this is what they became. They lived in these structures of Corestuff."