f84r "Covered Pool"

[VViews]

Hi everyone,

Looking closely at f86r, the so-called "Covered Pool" illustration, I just noticed a feature I hadn't seen before, and I want to bring it up here for discussion.

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Up until recently I had assumed that the vertical squiggly lines which extend into the pool from the "ceiling" were either steam rising or water pouring down, or maybe even some sort of supporting element like pillars or stems holding up the upper part.
But upon closer examination, I realized there was a problem with all of these interpretations. Look at this zoomed image:



The squiggles don't just hang down. Two of them actually connect together forming a U, like some sort of bunting/garland.
This feature seems to only occur on the far right of the image.

In factif we look at the whole pool, going from left to right:
the first three sets of vertical squiggles stop in midair, the fourth and fifth touch/dip into the pool water (unclear which because of green paint), and the last two form a U-shaped "bunting"-like shape: they are connected, either underwater or floating on the surface.


I'm really not sure how this can be explained or what it's meant to illustrate, but as far as I know, fluids don't behave this way.