What is it like to live with a solipsist

(since this essay is a bit long, I have to publish it in two parts)

My roommate always claims that he has a metaphor about the world he lives in, that everybody besides him is an actor. They appear in his life here and there occasionally following the orders of a hidden director. They talk with him and have stories act out scripts with him without havign true feelings in their minds. It is he who will always be is the only real person there and undergo experiencing all of these things. In fact, if you have seen watched the movie <em>The Truman Show</em>, you would understand what I mean. For him, he is the only true person in the world, and others are all everyone else is a robot, a zombie or an actors, without a soul or consciousness.

I have asked him about what makes it so important to assume that he lives in a theatre, or why did he treat believes himself to be so special. He replied that it is because he is the only one who will never leave the play. In fact he concluded that he will never die, because he is the only audience in this play and without him the world can  not hardly continue to exist. I commented that he is not the audience but the camera, and that the world would still exist without that particular camera. under which the world can exist. Like what As in quantum physics that where the quantum state of a particle is determined only when it is observed. there is an observer. As to For him, the whole world is a Schrödinger’s cat, and it relies on his observation for its continued existence. to continue existing.

But so what? I can also imagine that other people don’t have minds and that they are all NPCs in a giant MMORPG world. However, considering that I cannot quit the game until I die, and that I cannot enter into other people's heads, why should I assume that they are all fake and that I am real? Even if they are all fake in theory, should I act differently or respond differently to them? No. So basically I am an agnostic and I do not care about the “truth." If other people can pass my Turing test, I have no reason to treat them as non-human.

So I asked him to imagine that there are two people, one is real in his sense, and the other is an actor（but acts completely the same as real people). Now there is a train coming and both of them are each of the guys is standing on different tracks. railways and you can determine onto which railway track the train will go. reach.(Yes, it is like the famous moral dilemma.) So which one will you choose to kill? [or better, <em>let die</em>] He replied, "the fake one of course." I snigger sinisterly in heart and kept askied, “Then what if the fake one is a girl that you have already fallen in love with, and the real one is just a stranger?”

“Well,” He said, “That depends”