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Last semester, we also came to the same conclusion (or hypothesis) that our reality - or perception of it- is just a construct of the brain.

I insisted that there are some concrete realities that transcend one's perception. For example, if all the brains in the entire class agreed that we were sitting on chairs, then the concrete reality was that we were sitting in chairs. I thought that if many independent minds share certain perception of reality, then the perceived reality must be real. Any thoughts?

Nowadays, I'm not so sure because the fact that the perception is shared may just be a construct of the brain in itself...