If you'd like to explore this subject in a structured way, then there's a large library of philosophical writings on the subject :). I think Hilary Putnam's ess

If you'd like to explore this subject in a structured way, then there's a large library of philosophical writings on the subject :). I think Hilary Putnam's essay on "Brains in a vat"[1] may be a nice starting point, from which can explore both earlier and later work. [1] http://evans-experientialism.freewebspace.com/putnam05.htm http://evans-experientialism.freewebspace.com/putnam05.htm