that as you please. Be seeing you."

He broke contact, knowing that Hyrst and Shearing would close him out. From now on, Hyrst realized, he would keep track of them the way he and Shearing had kept track of obstructions in the path of flight, by mental "sight". The yacht was extremely close. Suddenly Hyrst had a confused glimpse of a hand on a control-lever over-lapped by a view of the black-mouthed tubes of the yacht's belly-jets. He dived, literally, into a crack between one of the monoliths and a slab that leaned against its base, dragging Shearing with him.

The yacht swept over. Nothing happened. It dropped out of sight, braking for a landing.

"Imagination," said Shearing. "You realize a possibility, and you think it's so. Tricky. But I don't blame you. The safe side is the best one."

Hyrst looked out the crack. One of the tugs was coming in to land beside the skiff, while the other one circled.

"Now what?" he said. "I suppose we can dodge them for a while, but we can't hide from Vernon."

Shearing chuckled. He had got his look of tough competence back. He seemed almost to be enjoying himself. "I told you you were only a cub. How do you suppose we've kept the starship hidden all these years? Watch."

In the flick of a second Hyrst went blind and deaf. Then he realized that it was only his mental eyes and ears that were blanked out as though a curtain had been drawn across them. His physical eyes were still clear and sharp, and when Shearing's voice came over the helmet audio he heard it without trouble.

"This is called the cloak. I suppose you could call it an extension of the shield, though it's more like a force field. It's no bar to physical vision, and it has the one great disadvantage of being opaque both ways to mental energy. But it does act as a deflector. If Vernon follows us now, he'll have to do it the hard way. Stick close by me, so I don't have too wide a spread. And it'll be up to you to lead. I can't do both. Let's go."

Hyrst had, unconsciously, become so used to his new perceptions that it made him feel dull and helpless to be without them. He led off down one of the smooth rock avenues, going away from the skiff and the tug which had just landed.

On either side of the avenue were monoliths, irregularly spaced and of different sizes and heights but 

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