I have a consciousness that seems to exist because I am experiencing it, and right now my consciousness thinks I am in front of my computer typing a post on
susans.org under the subject of Existence. But does my computer or keyboard or
susans.org exist? I can't know. I have to listen to the input of my fingers and eyes so I'm sensing the world by proxy, therefore, I can't really trust the input I'm being given as proof of existence. I could be asleep right now, I could be in the Matrix. I don't really know. I also have no idea if anyone will really see this text or that any feed back I do get is coming from anyone other than myself because everything could just be a figment of my imagination.
My consciousness might not even exist I suppose, I could just be experiencing something that I understand as consciousness, somehow. So something has to exist, right?
I had an art teacher who liked to talk about this stuff and we went over it in a Philosophy class I took. Quite the thought exercise.