Maybe not a computer simulation but a simulation nevertheless. What people never think about is that we are living in a world that was created just for us. Anywhere we go things are created and placed for our comfort. Most of us will never have to grow or kill our food. We just go to a shop and get what we want. Some of us, if we want, can live without ever getting out of our home. It's almost magical. Yes, it's a simulation but it wasn't created by some mystical creator but humanity's collective mind. With the exception of the raw materials there is little natural about our daily world. Where in nature can you find a car, a house or, for that matter, a corporation like Google. Everything has been created for us by the collective human mind. It's all a simulation.