Sure, not to mention of everything that don’t exist. No one guarantee this talk won’t be nonsense though.

Great question. Here’s an interesting collection of different views from reputable thinkers: https://youtu.be/z5qtyOwsiEk

Depends on what you call a “thing”. If a “thing” can be any system, in all it’s complexity, then no. There are everyday system (man-made or not) that are just to complex to fit in a single mind !

Probably not. There are quantum phenomena and other multi-dimensional questions that we can only approach via flawed metaphors and vast over-simplifications.

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