For example, today I was playing RayCrisis on the PC and there was one thing that caught my attention.
At the stage “Consciousness Part”

You descend into an area where there is a large vertical tubular stream of liquid, which is elevating and passing through the level and large battle ships flying around it. At some point you enter the tube and the fight with the end level Boss commences.
I was wondering, what is this tube supposed to be really? Is it made of liquid, the surrounding area made up of air and the battleships flying over? Or is it the other way around? The tube made up of air and the whole area surrounding it engulfed in liquid and the battle ships actually being submarines that float around the void of the tube?
How could (if?) this be “explained” scientifically?
What were the Taito artists thinking when they conceived this idea?
What other similar elements can you think of in other shooters?