 One might reject realism about quiddities even if one accepts structuralism about physics. As Chalmers (2013: 254) writes, “There are respectable structuralist or dispostionalist views of physics on which physics involves just structure or dispositions all the way down” (e.g., Ladyman and Ross, with Spurrett and Collier 2007; Ney 2015; cf. Shoemaker 1980; Hawthorne 2001; McKitrick 2003). But Russellian monists and others (e.g., Lewis 2009) regard such structuralist or dispositionalist views as implausible. That is because such views “seem to yield a world devoid of substance or qualities” (Chalmers 2013 [2015: 254]). A world devoid of substance or qualities might or might not be possible. But according to realism about quiddities, the actual world is not like that.