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Underground Garden/Forest using a Sunlight siphon

 
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So I have heard about a project in New York where they use what I'm guessing is a form of fiber optics to pull natural sunlight underground to their park their building. http://thelowline.org

What I'm wondering is how could one do this at home assuming they had the means to do so without excessive costs? Any ideas?

I'm at a loss and my reasons for asking are for a site a friend and I are working on where we will be talking about permaculture and survival/SHTF situations and this seems like a great subject but there is little about the technology that I can find online to write about a diy sort of project.

Thanks to all who help.
 
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Looks like there is a lot more information on their pilot project, "the Lowline exhibit",  might have to dig through the articles to get more info and perhaps a patent search?

Snip "The exhibit shows off exactly how their design will work. A parabolic sun collector attached to the roof of the building collects sun light which travels through a fiberoptic heliotube and is then dispersed by a canopy distributor. A small park with grasses and a tree were installed beneath this canopy, showing their desire to create enough sunlight to allow photosynthesis to occur below ground. Once you view this display, you can really start to see that this radical idea could get pulled off–and look beautiful."

From this article.  Lowline

Another from  wiki
 
But how did the elephant get like that? What did you do? I think all we can do now is read this tiny ad:
Sepp Holzer's 3-in-1 Permaculture documentaries (Farming, Terraces, and Aquaculture) streaming video
https://permies.com/wiki/141614/videos/Sepp-Holzer-Permaculture-documentaries-Farming
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