IMO it's important to define what magic is, because the definition probably varies from person to person. I tend to use the Oxford definition when defining magic:
Magic
[Noun] The power of apparently influencing events by using mysterious or supernatural forces
If I were to use that definition as a starting point it seems like "magic" can be viewed as more of a state of mind than something literal. If I witness something and I have absolutely no knowledge, experiences or senses that can give me an understanding of what it is that I am witnessing, then from my perspective I am witnessing "magic." It doesn't really matter what the thing is so long as I have no ability to understand it via "natural" means. Note that magic doesn't have to be literally supernatural --> anything sufficiently mysterious from my perspective would qualify. And since it is a state of mind, I can end up seeing "magic" due to hallucinations, mental disorders etc.
Of course, this also implies that as I gain knowledge and experiences, and as my ability to sense the universe around me increases, things that were initially "magic" from my perspective would no longer be so once I have the beginnings of the ability to understand them. Note that this doesn't mean that my understanding necessarily has to be correct, merely that I am able to understand it enough to know that there is a rational natural explanation for it.
So, do I believe in magic? I would say yes, in that I believe in the possibility that there may be things in the universe that are beyond the ability of human beings to comprehend or understand, and thus they would seem "magical" from my perspective if I were to witness them (I have yet to actually witness such a thing though). And I believe in "magic" in the sense of hallucinations / mental disorders / my brain trying to "see" things in the dark etc being able to distort my perspective of reality so that I witness mysterious or supernatural things even though they didn't actually happen.
I don't know if my ideas make any sense or not, but that what happens when you try to type something when you are lacking sleep
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