But human knowledge extends to things that cannot be visualized. For example, we have knowledge about concepts such as democracy, human rights, and mathematics. We know many facts about these concepts, but we are unable to organize these facts in a way that resembles a three-dimensional object. You can’t easily make an image of democracy. But there must be some form of organization to conceptual knowledge. Concepts such as democracy and mathematics are not just a pile of facts. We are able to reason about them and make predictions about what will happen if we act one way or another. Our
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