If what we think we know about the brain is true, then what we call reality is contingent on the majority of brains agreeing on it. That is, we'll call reality

If what we think we know about the brain is true, then what we call reality is contingent on the majority of brains agreeing on it. That is, we'll call reality what my brain and your brain can come to believe independently. But that still means that what we know is just what our brains limit us to knowing, and it doesn't preclude something outside of that. You may argue, it's pointless to discuss something that by it's very definition is unknowable, but the fact that we can describe it by something in system (our language) should make us somewhat curious about it. sigh Forty years later I still miss the dorm room discussions.