Quote (Jagx @ Mar 17 2012 03:26am)
http://en.wikipedia.org/wiki/SolipsismSolipsism is the philosophical idea that only one's own mind is sure to exist. The term comes from Latin solus (alone) and ipse (self).
Solipsism as an epistemological position holds that knowledge of anything outside one's own mind is unsure
The wall is still there because you are observing it. It doesn't mean "looking at it" per-se but it means that their is an acknowledgement of it's existence at that time. so matter is expected to be there.
what about watter you weren't aware of still being there even though you had no idea about it? if your case was to make sense it would mean anything you aren't aware of simply doesn't exist so once you are affected by something you weren't aware of it no longer is valid.
go get blindfolded,deafened and put out in a location you are not aware of and see if matter is there or not.