 Despite Thomas Kuhn’s (1957, 181) suggestions to the contrary, the success of Copernican astronomy over Ptolemy’s system has remained an influential case study fostering the simplicity view (Martens 2009). Moreover, in ordinary scientific problems such as curve fitting, formal criteria of model selection are applied where the paucity of parameters can be interpreted naturally as a key dimension of simplicity (Forster and Sober 1994). Traditionally, two main problems have proven pressing, and frustrating, for the simplicity approach. First, how to provide a sufficiently coherent and illuminating explication of this multifaceted and elusive notion (see Riesch 2010); and second, how to justify the role of simplicity as a properly epistemic (rather than merely pragmatic) virtue (see Kelly 2007, 2008).