“One possibility is that we will build 3D printers and create organic humans based on our software personalities just to experience reality through five senses. An organic creature can keep learning its entire life. So our future software selves might find a need to bring some of our minds back into organic form just to keep up the challenge and the learning. And you know where this is going. If the scenario I described might happen in the future, how can we know it didn’t already happen and we are the second-generation organic humans?”

Scott Adams thinks it is and makes his case here.