Arguments for quidditism have notable parallels with arguments for haecceitism. Some quidditists suggest that our pedestrian modal judgments support quidditism (see, e.g., Lewis (2009: 209), while other defenses of quidditism can appeal to the apparent conceivability of scenarios where properties swap their causal-nomic roles. Additionally, Bird (2007: 74–76) considers but rejects a property-theoretic analogue of Chisholm’s Paradox that, if successful, establishes quidditism. A different line of argument, which has no direct analogue in the case of haecceitism, appeals to combinatorial principles regarding the nature of modality. These combinatorial principles hold that various permutations of fundamental properties across, say, causal nomic roles, correspond to distinct maximal possibilities, which, if genuine, would differ only quidditistically. (See Lewis (2009: 209) for the combinatorial argument and Locke (2010) and Schaffer (2005: 10) for discussion.)