https://www.quantamagazine.org/a-math-theory-for-why-people-hallucinate-20180730/
Druggos please confirm whether or not youve see them. 
The paper is called What Geometric Visual Hallucinations Tell Us about the Visual Cortex.
Your brain does secret coordinate transforms it turns out
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Oh I've read this one before.
No idea if it's real, but sounds bullshit (or at the very least very handwavy and non-rigorous). But I shouldn't be allowed to comment on these things because I have absolutely 0 authority
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