"No.  You see, hear, feel them - everything.  It's like an image in a stereo tank, only perfect and put right into your mind.  But - Look, Jubal, the whole thing would be a silly question on Mars, but I realize it isn't, here.  But if you had been present at the discorporation - death - of a friend, then you helped eat his body... and then you saw his ghost, talked with it, touched it, anything - would you then believe in ghosts?"