I recently watched a tv show that produced a line of questioning in my head on

I recently watched a tv show that produced a line of questioning in my head on

I recently watched a tv show that produced a line of questioning in my head on the virtue of reality. How do we define reality? What's the difference between reality and a world that is the perfect replication of reality? What would be the difference between the two worlds? Is it truly possible to know when we are living in reality? I guess I'm mostly asking if there is work form past philosophers that I could read on the subject?

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