Poor husbandry aside in the exhibit aside, I think the concepts behind some of the designs are great. The interplay between air and water, the juxtaposition between the stark out of place geometric shapes and plants is kind of refreshing. Some of those ideas with minor tweaks such as fewer livestock (or plants only) and proper filtration would definitely be sustainable.
These design are not any more "natural" than the miniature trees, mountain scapes, forests, waterfalls and footpaths created with what is accepted as "aquascaping".
7g Cube -
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