 So, on the one hand, there is what might be called the “supervenience intuition”. The nonreductive physicalist thinks that the metaphysically necessary supervenience of the mental on the physical means that mental properties are nothing over and above physical ones, and the believer in unrestricted mereological composition thinks that the metaphysically necessary supervenience of fusions on their parts means that fusions are nothing over and above those parts. On the other hand, there is what might be called the “distinctness intuition”—if mental properties and mereological fusions are distinct from physical properties and mereological atoms, respectively, then surely they count as something over and above them. 