I seem to remember, as a space cadet, before a trip in a Sioux at Ternhill many moons ago, that the yellow line painted around the bubble canopy was there to prevent similar feelings of insecurity.
Just possible that it was put there as an attitude reference.
In my green phase I was aware of a lot of people who much preferred jumping at night - they couldn't see the ground when they were in the door. Most people hated jumping from a balloon.