Report The supernatural? in Metaphysics and Epistemology Posted February 19, 2012 This again? What makes you think that just because your brain is in a jar , it would make reality nonobjective? "If the vat is reality" - You mean if the vat was all that the universe consisted of? In which case there is no outside world and your question makes no sense? Or less sense than it would without that particuilar contradiction.