I sit in this room all day long. Staring at the wall across the room, I envision myself running and passing through it like a ghost. I could stare a hole in the wall. The point where my eyes are hitting the wall is bound to break and open up. I wonder if I got up and ran at the wall, would it let me pass? Like diffusion I would be a particle that could pass unchanged through its permeable membrane. What would happen when I came out the other side. Would I be in the other room, or would I pass into nothingness; maybe I would be in another dimension. No, I couldn't pass through a solid wall with out a forceful impact. Either I would be wilted by the wall and fall to the ground a failure, or if it's thin enough I could bust through it. But, the wall will not simply let me pass. It is a solid structure that is not permeable to a human being. I can't stare a hole in and I definitely cannot make it move. I could just get up and use the door if I wished to leave. I'll use the door.