Another levitating current carried him along some hundred yards of mural-faced corridor to one of the pedestrian entrances of the Opal Cross. A group of revelers stopped their crazy, squealing dance in the current to watch him. They looked like figures swum out of the potently realistic murals--but with a more hectic, troubled gaiety on their faces. There was something about the way he plunged past them unseeing, his sleepwalker's eyes fixed on something a dozen yards ahead, that awakened unpleasant personal thoughts and spoiled their feverish fun-making. The pedestrian entrance was really a city-limits. Here the one-building metropolis ended, and there began the horizontal miles of half-wild countryside, dark as the ancient past, trackless and roadless in the main, dotted in many areas with small private dwellings, but liberally brushed with forests. A pair of lovers on the terrace, pausing for a kiss as they adjusted their flying togs, broke off to look curiously after Thorn as he hurried down the ramp and across the close-cropped lawn, following one of the palely-glowing pathways. The up-slanting pathlight, throwing into gaunt relief his angular cheek-bones and chin, made him resemble some ancient pilgrim or crusader in the grip of a religious compulsion. Then the forest had swallowed him up. A strange mixture of trance and willfullness, of dream and waking, of aimless wandering and purposeful tramping, gripped Thorn as he adventured down that black-fringed ghost-trail. Odd memories of childhood, of old hopes and desires, of student days with Clawly, of his work and the bewildering speculations it had led to, drifted across his mind, poignant but meaningless. Among these, but drained of significance, like the background of a dream, there was a lingering picture of the scene he had left behind him in the Sky Room. He was conscious of somehow having deserted a friend, abandoned a world, betrayed a great purpose--but it was a blurred consciousness and he had forgotten what the great purpose was. Nothing seemed to matter any longer but the impulse pulling him forward, the sense of an unknown but definite destination. He had the feeling that if he looked long enough at that receding, beckoning point a dozen yards ahead, something would grow there. The forest path was narrow and twisting. Its faint glow silhouetted weeds and brambles partly over-growing it. His hands pushed aside encroaching twigs. He felt something tugging at his mind from ahead, as if there were other avenues leading to his subconscious than that which went through his consciousness. As if his subconscious were the core of two or more minds, of which his was the only one. Under the influence of that tugging, imagination awoke.