According to the “flat view” (Gillett 2002) realization is a relationship between different properties of one and the same thing (Kim 1998; Shapiro 2000; Shoemaker 2003, 2007; Polger 2007). The subset view, which holds that a property P1 (e.g., mean kinetic energy of the gas) realizes property P2 (e.g., temperature of the gas) when the causal powers distinctive of P2 (temperature) are a subset of the causal powers distinctive of P2 (mean kinetic energy), is an example of the flat view. P1 and P2 are both attributed to the same thing, the gas (Gillett 2002, 2003). The dimensioned view describes realization as a relationship holding between the properties of wholes and the properties of the parts and their organization. This view of realization comports with the explanatory aims of the special sciences and fits nicely with the evidential base on which interlevel claims are grounded (see Aizawa and Gillett 2011). Gillett has since expanded this notion to handle the realization of objects, properties, and processes (Gillett 2013); for criticism and alternatives, see Polger 2010; Melnyk 2003; Melnyk 2010)