"More could be remarked about, Doc," I said. "We know that the Xians were once of human-size, and of the same order of life. So somewhere in their long and checkered history, their survivors invented this new vital principle, and changed themselves. There may be various reasons why they chose to be tiny. Hiding, for instance. But as you once said, that's just part of the android advantage, and not the real issue. Here is a step in scientific development probably as much to be expected as television. If micro-androids can be made, so can larger ones! There's your pending problem on Earth, Doc, natural man versus his far tougher, more flexible competitor! Ultimate newness. It can be real! And wonderful! But to many it will be a fearful thing." Doc's doll-like visage fairly shone. "The warning, eh, Charlie?" he chuckled. "The demigod dream coming to a head in eagerness and cold tension. Shock of the utterly novel versus tradition, even instinct! No ills; practical indestructability. Immortality, perhaps. The old, human hope! And yet?... But should or can progress ever be stopped?... Damn, if we can only take this process of conversion home!" "You two talk of going home, and of lots of big things," Jan complained. "But do we even know where we are? Just where is this room, and those houses and gardens out there, in a great hollow space like a bubble cavity in a glassy clinker? Of course such a cavity, a few inches across, would seem enormous to us." Dr. Lanvin studied her soberly. "You're sharp, Jan," he said at last. "A bubble cavity, like in an old clinker. Umhm--m--many asteroids have that sort of structure, maybe formed by the sudden relief of a planet's internal pressure, when X was blown up. Steam and air made the bubbles in the molten, glassy lava. But when it cooled and solidified, the air, and the condensed water of the steam, remained sealed inside, unable to escape into space. Explorers have found microscopic green plantlife growing in many of those cavities, for through the glassy lava sunlight can penetrate, as it seems to do here. Thus, a perfect natural environment for living things in miniature was created. And a perfect retreat. By gosh, Jan, I believe you're right!" Doc had always had almost a child's love for small objects. But my own enthusiasm was less complete. Call us all super-mites, placed beyond most of the physical ills of men; but Jan and I were still prey to nostalgia and panic and claustrophobia, for these are things of the mind. Hard men have gone mad in space, because they felt cut off from everything familiar. But at least they had their normal forms and size, and a known way back home. They weren't caught in a clinker cavity beyond a barrier of magnitudes that appeared more insurmountable than a hundred light-years of distance. It was a treachery of our primitive thought patterns, I knew. It was against progress, and the explorative impulse. Yet I knew that it would have to be reckoned with.