But our senses are very limited, and we cannot access that reality beyond ourselves directly, with our minds. Therefor this idea that you call "objective reality" is really just a subjectively derived presumption of what this reality beyond ourselves, is.
We continue to differ on this point. As I've said before, we know about the world external to the self via our senses. It's where our parents, air, water, food, shelter, society and RF are found. As I've also said before, if you think instead that the self is everything, try going without air for an hour and let me know how that works out for you.
Which is why even though we are all presumably living in it, we still have different ideas about what it is. And we can never be sure who's idea, if any, is the more accurate. We all presume that ours is, but we are all biased by our own preferred criteria for assessing it's accuracy.
Therefore, I trust, you've noticed that science has emphasized the importance of maximizing objectivity using empiricism and induction, publication with peer review, repeatability, frankness and honesty, and clear distinctions between hypotheses, experiments and conclusions. And no claim to absolute truth anywhere.
Thus we set out to learn about the universe, the quantum world, life, the human brain, the materials and techniques of industry and production.
No, it doesn't. But we don't really know this reality beyond ourselves. All we have of it is the idea of it that we created in our minds based on our very limited sensory experiences of it and whatever preferred criteria we chose for assessing it.
And yet here you and I are, conversing over the internet with virtually instant communications our ancestors never dreamed of. And with colored pictures too! (Or, too!!!!)
Not at all. By your criteria for claiming that there "are no known unicorns" (their reality, in your mind, being determined by their physicality), there are also no known #3s. And yet without there being a whole number between 2 and 4 virtually all mathematical equations would fail, and everything we humans have ever done based on those mathematical equations could not have happened.
All maths is of the mind. The elements of maths ─ numbers, fields, group theory, on and on ─ are thus of the mind. You may find the phenomena of physics out in reality, but the maths ─ the algebras, transformations, tensor calculus, matrix formuli &c ─ of the explanations is all mental. As I said, search as you will, you'll never find an uninstantiated 2 running around in the world external to the self. For there to be 2 of anything, a brain must first decide
what is to be counted, and the
field in which it's to be counted ─ two chickens in the barn, &c &c.
There is no Platoland, there are no Platonic forms.