Where does 1 + 1 = 2 (or math) live? Is it in any way related to us, our experiences, our senses, or evolution? Is it part of objective reality or just some abstract idea?
I agree though, with just our senses, we can never experiences the reality - just as simply we cannot see molecules - but we know they exist? We understand the molecular machinery of the cell, though we cannot see nor experience it.
Math is a more interesting case, in that regard, as it is more clearly divorced from sense data in the classic sense. Though with the nondual perspective being presented here in mind, thought and logic is often lumped in closer to being a kind of sense - I don't _think_, I _experience thoughts_. I'm not settled on the point, but that framework would allow us to say "math is a function of the way human brains sense logical resolutions among axioms".
I do see that ultimately everything is painted in my mind by my senses and I rely on this painting for my interpretation of the world. If I didn't have senses since birth? I wouldn't have the painting nor any understanding of the world except for, maybe, a sense of hunger and an urge of bodily secretions.
Regardless, the world continues to exist as is.