There is a physical manifestation of something that we describe as light or gravity, but our understanding of those things is, in fact, socially constructed jus

There is a physical manifestation of something that we describe as light or gravity, but our understanding of those things is, in fact, socially constructed just like "money" (or really, an economy) is. We have an imperfect model of what both light and gravity are and we use that model to describe things we observe, but the map is not the territory and it's actually incredibly important to understand that. In all three kinds of things, belief that something is true -- even mass, near unanimous, collective belief that it is -- does not make it so. That was true for Newtonian physics and gravity as it is for, say, the idea that "interest rates and inflation are connected."