The effect had been similar, though to a lesser extent, with some technical and engineering experts of the Hawkshead's crew, and it was largely as a result of their subsequent work that the exploration ship Columbus would be able to fly at close to tachyon speeds, bringing the core of the galaxy within mankind's reach. Other members of the same group had formed a cadre of inspired technocrats who, with material assistance from Terranova, were playing a vital role in the Renaissance.

The after-effects of the unique encounter had not been uniformly beneficial, however. The three men who had not been able to participate in Project Recap had been jolted by their experience into a profound autism which still gave little sign of abating. Dallen himself, prime target for the Ultans' psychic energies, had been disturbed for weeks, prone to nightmares and loss of appetite, alternating between periods of torpor and hyperactivity. When he had learned that his work for the Project would involve repeated and full-scale mental regression to the encounter he had at first refused to cooperate in any way, and only gradually had overcome his instinctive fears. There had also been the problem of his disbelief in the essential proposition.

The central idea was that the Ultans could be used retrospectively as a kind of sounding board for scientific and philosophical beliefs to be specially implanted in Dallen's mind. By drug-intensified hypnotic regression he would be able to meet the superhuman entities again and again, recreating a special state of consciousness, continuing to harvest or corroborate knowledge, to glean and scavenge until the law of diminishing returns made the exercise pointless.

His scepticism had gradually faded when he discovered he had already, in association with Billie Glaister, helped change men's dunking about no less a question than the ultimate fate of the universe. Cosmologists had never been able to find enough mass in the universe, even with allowance for black holes, to guarantee that it was closed and therefore cyclic. The best they had been able to hope for was the Einstein-de Sitter model of a marginally open or flat universe, one which barely expanded but would go on doing so for ever. However, the mindon graviton component imposed a positive curvature on space time, promising an infinite sequence of Big Squeezes and Big Bangs. The cosmological timescales were such that Dallen could feel little personal concern, but he could see that a cyclic universe was more pleasing to philosophers.

Of much greater interest to him were the questions posed by the mindon science of the Renaissance. The very fact that it not only accepted personal immortality, but had it as a cornerstone, made it unlike any scientific discipline that had gone before. It was exuberant, optimistic, mystical, life-centred, full of wild cards, boasting as one of its creeds a statement hypnotically retrieved by Dallen from the Ultan encounter: It is the thinker in the quietness of his study who draws the remotest galaxies back from the shores of night.

Dallen liked to regard himself as an integral part of the universe, and he savoured the irony in the way in which human beings, who had until recently accepted a life expectancy of some eighty years, were now debating their prospects of surviving the next Big Bang as mindon entities. "Science used to be preoccupied with tacking on more and more decimal places," a colleague told him. "Now we add on bunches of zeroes."

It had been that moral buoyancy, the powerful life-enhancing elements of mindon science, which had given Dallen the necessary incentive to join Project Recap. To the world at large the demanding aspect of his work had been the mental wear and tear caused by the periods of intensive study of abstruse subjects followed by regressions and the subsequent debriefings. Dallen had found the process intellectually harrowing, but the principal strain had been emotional — for it entailed his losing Silvia London time after time. One system of thought demanded that he regard her as having lived out her life billions of years before the oldest stars in the universe were formed; but in another — the one which was instinctive and natural to Dallen — she was vitally alive, separated from him only by some malevolent trick of cosmic geometry. And both systems had exacted their due of bitter tears.

For months after the premature death of his mother Dallen had been haunted by fantastic dreams in which she was still alive, and on his awakening his grief had returned with almost its original force. A similar sequence occurred with Silvia. Over and over again, in the slow-motion quasi-existence of hypnotic regression, he saw her reaching her arms towards him as he flew upwards to the edge of the portal. He saw her tears and was able to read the words on her lips: I love you, I love you, I love you…

The subsequent dreams were varied. In some he reached the portal and forced his way through the diaphragm field in time to voyage with Silvia into the Region II universe, in others she remained behind with him in the normal continuum, but — dreams being what they are, with their own laws and logics — the one that troubled him most was the one which took the threads of reality and wove them into the most fantastic, least realistic pattern. Dallen had it on the authority of the Ultans themselves that there were anywhere from eight to forty of their titanic spheres in the Milky Way system. He had also been told that the sphere known to mankind as Orbitsville had been forced to leave earlier than scheduled — which meant that the others were still located in various arms of the galaxy, still making their unhurried preparations to depart for another continuum. In the dream Dallen sailed out on a tachyon ship, found one of the remaining spheres, and entered it just in time to be transported to a Region II galaxy. And in the dream he quit the second sphere and flew with magical ease and certainty to Orbitsville, and was reunited with Silvia.

To the dreaming mind such epic flights, far from seeming preposterous, are perfectly natural and normal, and that was the vision Dallen's unconscious elected to repeat most, its poignancy magnified by the very factors which divorced it from reality. At first he expected the dream to retain its full power, then he realised that his grief over the loss of Silvia was following the merciful and inevitable course of all passions. Pain softened into sadness, sadness mellowed into resignation, then it came to Dallen that he was truly a different person. The change had begun when he had finally acknowledged that he deserved to love Silvia and be loved by her in return, and it had been accelerated by his having, for the first time in his life, work he found absorbing and worthwhile.

Cosmogony and cosmology were only part of Project Recap's domain — there was the subject of the Ultans themselves. As the one who had had the closest mental contact with the enigmatic beings, Dallen was assigned the position of leading expert in the brand-new field of study, but he was well aware of his human inadequacies. In common with all other members of the original encounter group, when he tried to empathise with the Ultans, to penetrate their minds, all he divined was an overpowering sense of coldness. For Dallen the feeling was reinforced by his recollection of the icy calmness of the aliens, of their dispassionate reliance on logic as they tried to influence him mere seconds before the Orbitsville departure.

There were arguments and counter-arguments, all based on speculation. Perhaps the humans, like receivers tuned to a single radio frequency, had been oblivious to a wide spectrum of telepathic transmission. The Ultans, it was reasoned, must be capable of human-like feelings because they were engaged in conflict and were not above using subterfuge. On the other hand, perhaps they had betrayed no trace of emotion because — and this was the argument which had dismayed many people — the fate of Orbitsville, so important in human terms, was infinitesimal in the Ultan scheme of existence. After all, what did it matter about one sphere when more than a million times a million of them had been deployed in an Olympian struggle to shape a future universe? Nothing could be deduced about the probable outcome of that struggle, nor about the super-dimensional symmetry of the next Big Bang, using the fact that Orbitsville was now located in Region II. Orbitsville was too insignificant, a single grain of sand on a storm-swept shore…