I have naturally very low blood pressure witch means I sometimes faint especially when getting up when it happens I can see it coming a grab onto something however in the Biddle of it I lose my sense of hearing and touch allowing me to experience what most never will, nothingness the most well defined and yet abstract concept there is It is impossible to describe I do not see black nor white I just don't see nor do I hear but I can still think it lasts only a few seconds but is amazing to think I experience semi frequently what most humans never will the true absence of anything