Most things we observe in the real world are non-observables. That does this mean? Most things we care about and which make up parts of our world model are not photon counts in our ears of frequencies that hit our ears. Now, they constitute our world model theoretically, but I don’t describe my favorite tea cup by describing it’s constitution of molecules, but rather it’s high-level design.
Thus, we mostly care about things that we can not observe, but things that are latent (in the sense of: I can not directly observe my favorite tea cup, but instead I observe light photons that bounce off from the cup, which constitute my favorite tea cup).