to understand what is real, we must go to the basics. i think, therefor i am. so we have established that i am real. however lets take the convers, if you do not think, you are not. i do not think sometimes, does that mean i am not? however if i am not, then their is noting to think, so i must exist. now, we need to determine what i am. if you think that the conscience is the brain, then you have determined the existence of the body, and that their must be a world to house it. if you think that you are a spirit, then, because the body can't prove the spirit exists, then you can say the body is a representation of the minds "will" and that the world is the tool that is shaped by the minds "will". then you can say that the world that we observe is not real, but that the people around you are real.