There was something in the Animatrix that still haunts me after having watched it when it came out (right after the first Matrix). There is a scene where human

There was something in the Animatrix that still haunts me after having watched it when it came out (right after the first Matrix). There is a scene where humans have jacked in to a machine using cables and there is some conversation which leads to the line “To a machine, every input is artificial.” There’s nothing stopping more layers of simulations outside the ones we’ve seen already. (Except, of course: lack of mass market appeal)