An idea that keeps coming to me, is can we use 3D printers + breakthroughs in the way glass is used in building, to create novel environments where we can defy nature without destroying it?
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A year or so ago, didn't "Ideas and Discoveries (ID)" Magazine run a piece on Hexactinellid-glass structures yielding superb flexibility, lightweight design, and superb utility to futuristic architecture?
A 3D printer seems uniquely fitted to the job of producing such a structure.
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Once designed and cheaply printed/produced with help from modern technology, a Hex-glass multi-story habitat with a solar-power concentrator + mirror array fitted with synthetic volcanic rock could conceivably bathe and water many thousands of people daily without needing a connection to the public water supply.
Add a fish farm and/or a vertical farm of the vegetable type, and you have even more layers of filtration occurring.
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There could be very creative ways of using and then cleaning water without losing a significant amount of it or expending undue amounts of energy heating and transporting it...
will write more later lol can't stay right now