How do you know the universe is real?

[Babylon]

How do you know that the universe is real, and not just a grand illusion perpetuated by an unseen force? How do you know that you do not simply live in a program created by another civilization? What if the civilization who created the supercomputer that holds the program that you live your life in were also created by another just like it, and only created the secondary supercomputer you currently survive in because of what the first supercomputer's code told them to do, in a type of supercomputer regression?

[Babylon]

How do you know that the universe is real, and not just a grand illusion perpetuated by an unseen force? How do you know that you do not simply live in a program created by another civilization? What if the civilization who created the supercomputer that holds the program that you live your life in were also created by another just like it, and only created the secondary supercomputer you currently survive in because of what the first supercomputer's code told them to do, in a type of supercomputer regression?