# Objectivist Reductionism Alex Byrne and David Hilbert **Opening (not a real abstract):** Physical objects like lemons, canaries, and lumps of sulfur have a myriad of physical-chemical properties. Some of these properties are shared: all three kinds of objects have mass, for example. Some are unique: only lumps of sulfur are composed of a single element, give or take a few impurities. Some are partly shared: lemons and canaries both contain carotinoid pigments. We may assume that “physical-chemical properties” are specified in a relatively restricted language—in particular, one that does not contain color words like “yellow”. Now imagine an uncountably large book in which all and only the shared physical-chemical properties of lemons, canaries, and lumps of sulfur are inscribed in this restricted language. Since objects of these three kinds are yellow, a question arises: Is yellowness among the properties mentioned in the book? **Authors:** [[Objectivist Reductionism]]