 It is plausible to interpret Sidgwick as suggesting that although we seek explanatory power when we develop our account of the physical world, we need to be prepared to admit brute contingency: the possibility that our best theories or explanations include claims like “and these just happened to be the initial conditions”, or (to be anachronistic) “it is a brute fact that the quantum wave function collapsed this way”. By contrast, we cannot admit the analogous idea that it is a brute contingent fact that a certain ethical property just happens to covary with the base properties that are instantiated around here. Because of their modal scope, ethical supervenience theses reflect this ban on brute ethical contingency (compare also Shafer-Landau 2003, 78; Smith 2004, 225).