No text, but a visual code

[ololololo]

y drawing those houses over the abyss or that tower without a base, the artist achieves a vertical profile that suggests there is nothing below. This creates the sensation that everything is suspended in space.

I don’t think so. I would assume that all Rosettes are depicted as objects floating in the air.
If you take a closer look, the Rosettes are mainly connected by something resembling rocks; this is clearly visible at the bridge between the Northwestern and Western Rosettes. These cliffs always have clear boundaries separating them from something that looks like waves (so I assume this might be a reference to water, but let’s forget about that for now). There is no flat surface anywhere.