You are a simulated person running inside a simulated universe that is being simulated on a physical brain inside a physical human inside a physical universe.

You are a simulated person running inside a simulated universe that is being simulated on a physical brain inside a physical human inside a physical universe. With meditation you can learn for example how to turn off your simulated self. With certain psychoactive substances you alter the dynamics of your physical brain which causes it to simulate a somewhat different universe.