this book I propose that people in the ancient world believed that something existed not by virtue of its material properties, but by virtue of its having a function in an ordered system. Here I do not refer to an ordered system in scientific terms, but an ordered system in human terms, that is, in relation to society and culture. In this sort of functional ontology, the sun does not exist by virtue of its material properties, or even by its function as a burning ball of gas. Rather it exists by virtue of the role that it has in its sphere of existence, particularly in the way that it
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