We already do, they're just much more primitive than our reality and very limited in the scope of what they simulate.
If we're in a simulation, it's possible the same is true. That our reality only is a simulation of some parts of the reality above ours, and at a lower fidelity.
If we're in a simulation, it's possible the same is true. That our reality only is a simulation of some parts of the reality above ours, and at a lower fidelity.