Gem,
Closing one's eyes works too....for a very short while.
Did the annual dive training gig for the Sheriff's Office today....did a Short Haul evolution that convinced me I am absolutely normal...I was uncomfortable having five guys hanging under the helicopter on 90 foot ropes....if I had been on the rope instead of flying it....I would have been petrified!
Now ask me if I had any misgivings about hovering over the middle of a large lake for three and a half hours in a single engine helicopter (with no emergency floats....)....one cannot be too introspective in this business.