I wrote here recently about the old issue of the two tables. There is the commonly-perceived solid wood object, on the one hand, and the sciency object of empty space with some whizzing electrical charges, on the other. As I said then, there are three ways of reconciling the two tables. One of them is the pragmatic way. The perceived table is a real thing, part of the world in which we live. The sciency table is a pragmatically useful model. BUT ... let us make the situation more complicated. What about the two skies? In the manifest world there is a dome-like presence above me. I clearly see it as having that shape. And I assign it predicates, "The sky is blue." Even the ubiquitous sentence "it is raining," which never has an antecedent for its pronoun, can be taken to refer to this sky. What is the sciency equivalent? What do we say when we say the sky is blue? We say, perhaps, that our eyes, looking upward, come into contact with light waves of the blue part of ...