Observation may just be a way to structure mathematics. It gives us a picture of the mathematical world. Reality is more than what we observe - it is something underneath our observation that is mathematical or inseparable from mathematical structures.Logical and mathematical relations are simply the way we structure observation.
Top, bottom, left, right, are no different, just more useful in certain situations, than PT.
PT doesn't actually describe anything that exists.
Math is a map, a language, a description, and way of describing, experience.
The source of experience is your deeper truth, but since it is always mediated by subjective experience, as Kant said, its unknowable, except as subjective experience.
Which isn't to say that we can't build a really good map.
To me it is a fallacy to assume a priori that the world is just what we observe.
Math certainly can be used as a language - but it is far more than that and much of it is unrelated to experience. Experience on the other hand, is always related to math. This is because it is the math that is real, the experience fleeting and uncertain.