what if our universe is a solo act? you watch, argue, project, love but what if you're interacting with a simulation? consciousness is invisible from the outside. you are the only person who knows with absolute certainty what its like to be you, and you cannot know with absolute certainty whats its like for other people, are they people, or simulations/information? maybe the consciousness you/we experience is the only one. yes you are the only mind in existence. a belief that no-one else exists is called Solipsism. i will never know what anyone else's inner or outer world is like.