Is Naturalness Natural?

The perfectly natural properties and relations are special – they are all and only those that “carve nature at its joints”. They act as reference magnets; form a minimal supervenience base; figure in fundamental physics and in the laws of nature; and never divide duplicates within or between worlds. If the perfectly natural properties are the (metaphysically) important ones, we should expect being a perfectly natural property to itself be one of the (perfectly) natural properties. This paper argues that being a perfectly natural property is not a very natural property, and examines the consequences.