A light dusting of Meinong cleared up quite a lot for me when thinking about whether or not an unnatural landscape exists.

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The premise is simple - if you can imagine it, then it exists.

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He designed a system that was separated into 3 sections, absistence, subsistence and existence. For whatever reason, it appears to be related to my system of natural, supernatural and unnatural. 

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Absistence (Unnatural) - Everything that you can think of has absistence.

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Subsistence (Supernatural) - numbers and concepts. Non-physical.

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Existence (Natural) - Everything that physically exists.

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