It's useless and irrelevant to cite various schools of thought on objective reality, because it's common sense and deductive reasoning.
To get a bit abstract, take the concept of time - time in and of itself does not exist, but is an organizational tool imposed by the human mind. It is a construct of the sentient mind that divides up the infinite for purposes of convenience and functionality. Time DOES NOT EXIST outside of the human brain.
I don't think I need to draw the dotted line to make the leap from this concept to the concept of objective reality...
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