RE: What's real? - Can we know if there is such a thing as objective reality?
Actually, we know objective reality exists, because the universe existed before life existed at all, yet it still did the same things in the same way it does now, which is why our planet is in orbit around a star, within a galaxy, and so on.
This is cause and effect. Because the moment life on Earth began was part of that chain of causes and effects which allows time and space in the universe to move forward, all events within life's timeline are part of that chain. Reality cannot be different for one element of that chain than another.
It is humans who misread reality. Not reality being different for each human.
If you say reality is different for each person, you are assuming that each person has perfect knowledge and understanding of reality. They do not.
Our brains are flawed, and filled with instincts and assumptions about things, and so it is easier for us to be wrong, than it is for reality to be different for each of us.
This isn't some sort of open-ended riddle. Reality is objective and exists outside of humans. Humans are the ones who have different brains, which yield different opinions, feelings and beliefs than other people.
Thanks for your comment @heretickitten. I'll consider what you've said more closely, but for now here are some ideas
How do you know that the universe existed before life existed?
Hm... I don't think I am assuming that. They might have perfect knowledge of their own subjective reality, or they might have imperfect knowledge of their own subjective reality.
How do you know that?
The other thing is, you're assuming I'm making a positive claim about the nature of reality. I'm not. I'm just saying that we can't know that reality is objective.