On an immeasurably larger scale, the dense core of the Earth was converging the waves that came from Thaar. In the ordinary way, the radiations of thought are unaffected by matter—they pass through it as effortlessly as light through glass. But there is rather a lot of matter in a planet, and the whole Earth was acting as a gigantic lens. As it turned, it was carrying Bill through its focus, where the feeble thought impulses from Thaar were concentrated a hundredfold.

Yet millions of other men were equally well placed: they received no message. But they were not rocket engineers: they had not spent years thinking and dreaming of space until it had become part of their very being.

And they were not, as Bill was, blind drunk, teetering on the last knife-edge of consciousness, trying to escape from reality into the world of dreams, where there were no disappointments and setbacks.

Of course, he could see the Army’s point of view. “You are paid, Dr Cross,” General Potter had pointed out with unnecessary emphasis, “to design missiles, not—ah—spaceships.

What you do in your spare time is your own concern, but I must ask you not to use the facilities of the establishment for your hobby. From now on, all projects for the computing section will have to be cleared by me. That is all.”

They couldn’t sack him, of course: he was too important. But he was not sure that he wanted to stay. He was not really sure of anything except that the job had back-fired on him, and that Brenda had finally gone off with Johnny Gardner—putting events in their order of importance.

Wavering slightly, Bill cupped his chin in his hands and stared at the whitewashed brick wall on the other side of the table. The only attempt at ornamentation was a calendar from Lockheed and a glossy six-by-eight from Aerojet showing L’il Abner Mark I making a boosted take-off. Bill gazed morosely at a spot midway between the two pictures, and emptied his mind of thought. The barriers went down…