This is a fascinating topic, and I would love to be proven wrong about this, but I think the fact you’ve gone unanswered means that there isn’t a satisfactory ELI5 answer to your question.
I’ve taken a handful of psych classes that have only touched on neuropsychology, but I think the scientific consensus is pretty much that the brain does some pretty wild stuff that we don’t fully understand.
The fact that your brain is able to simulate reality, and present it back to itself in a visual representation really calls into question about the nature of human consciousness, how we interpret reality, and how we exist within it.
Sorry this isn’t the answer you’re looking for. If someone else can provide something better I would be happy to hear it.
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