Looking further into the nature and rhythm of (night) dreams, we ponder the purpose, connection, and placement of dreams: Their quiet dark habitats suggest firstly a closet-mentality, of itself vivid, so distinct that in waking the thought works through a momentary vestibule of reconsideration, (usually) rejecting the dream, relegating dream visions to memory and recall (sometimes to later repetition, as if they were consequential as proof in mathematics). The quiet and dark also suggest that major attentions of the day are subordinated - lesser but constant attentions may persist: for examples, the brain encased in its skull may be a lunar (and solar) tide detector (possible the distant planets, Jupiter, etc., may be cranially locatable) of almost subtle differentiations wafting as motionless odors in the sleeper's own turns; and, it may detect UHF neutrinos, of near decimeter wavelength, generated in the depths of gravitational holes at the galaxy center (or cosmos center). But more cogently the dreams' mix of person and motions implicates a mix of realms: in dreams the sun is rarely (or never) seen, though in dreams mimicking awake (even as in the very bed and position) sunbeams may draw sharp shadows (hours before sunrise). In dreams, terminal velocity is about 4mph: this is astounding for it is neither 120mph as on Earth, nor is it zero, as the sleeper lies still - we can walk in our dreams, more freely than as through water, but not run (dash) lest our feet kick-out from under; we can swim-fly, and float-back-down without falling (fast or hard). Plainly the nights' walking-dream-shadowed realm is a recollection of a low gravity abode: either Venus-like where the atmosphere is 30 times thicker (90 times the pressure, but also 3 times the electrochemical temperature), or some gas planet around a tiny condensation of dirt (an asteroid smaller than a moon but enough to build a castle hundreds of miles high and wide, and possibly farther than Mars from our sun, as there are few survivable places near, not searched-out already). Our dreams then may be dreams of both real realms mixed in thought: not really mixed, for the difference in solar-orbit gravity precludes merely stepping across, but mixed as a dream-memory of both: we may not as yet have seen dreams of our day, or recognized them as dreams, but we know that prophets over the millennia have caught occasional glimpses or memories of a reality (far) different from our Earth-acquainted realism.
In evaluating the choice of recollections, Venus is not likely because it (must) have been billions of years ago that its atmosphere was cooler and breathable, and then it would have been thinner (as the CO2 carbon dioxide would have absorbed into the rocks and soil as carbonates) and more viscous, and because except the building construction were by (high temperature) air-floating foam it could not be hundreds of miles tall, per St. John's vision: Venus might yet be a refuge of air-floating cities, but only 34(32-36) miles up, in the cooler water clouds.
The alternative 'Venus' might be a planet revolving around some distant star, but it would have similar constraints: a thick oxygen atmosphere would be inflammable (tending to burn all things, to carbon dioxide), unless it were diluted with an unexpected hyper-abundance of nitrogen (which in such density would 'burn' in the oxygen to nitr(ous) oxide, which is a very active acid in water), or of argon (which is 'noble' inert, but comprises only 1% of our atmosphere: a small fraction compared to the oxygen at 21%). And still, tall structures would have to be floated, in stages, and would reach less than 60miles (the upper atmosphere) unless their bases were installed in deep water, but that would forestall utility.
The most likely possibility is a low-gravity realm around a very tiny moon, enshrouded in a large atmosphere thousands of miles thick (deep). The atmosphere itself would supply most of the gravity for holding itself together, and supplying breath near the center, while the moon, and dust collected upon it from meteorites, would supply ample building concrete for very tall structures even a thousand miles high, with the remnant of the moon at its center (floors) ... and there would be no sea. It would be a 'heavenly' city that could not be taken by force, as it surrounds its moon, leaving no basis for assault, and pieces would almost not fall, save slowly settle onto the floor below, and meteors would not be drawn, as there is little to no gravity beyond the much extended atmosphere, nor near the center, and comets (things already moving swiftly) would disintegrate and slow down to drift, long before reaching the inner atmosphere. Only something as large as a moon or planet or star or exploding star might pose a problem; and our solar system is mostly clear of such things in number: and such an air-ball planet might be steerable through interstellar space by detonating thermonuclear devices just near the outside of the atmosphere - indeed this planet might be a rogue beyond Pluto. The outer atmosphere may chill and condense into ice clouds, thus hiding any view of the sun and stars (which our dreams seem to never see), and thermally blanketting the inner atmosphere; and the deep (near central) atmosphere may be warmed and refreshed by infalling (meteoric) gas, ice, dust, and radioactive cosmic winds (and the slight gravity well may enhance this warming by accelerating and holding conducted-kinetic heat into the depths). The vast central region would be (often) misty as rain has nowhere to fall in so little gravity. If such an air-ball planet were a vagabond among the stars, it might be home to a manageable civilization of a hundred million people for millions (or billions) of our Earth years: its light and energy supply might be remnant radio-nuclei (as heats the center of our Earth) gathered from supernovae winds in space, which would add to the internal heat, if not something in high-technology (as anti-helium catalyzed fusion); rapid atmospheric lightning discharges might give it a continual armageddon-like appearance; the city would surround itself with a contingent of aero-space-going scout-vehicles; (one of) its scouts might have passed near our solar system six thousand years ago: and we may so infectiously remember living there; (maybe four-legged animals dream of recollected higher-gravity planet realms); ... and we may find 'home' there again.
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