 One motivation for realism in connection with at least some unobservables comes by way of “corroboration”. If an unobservable entity is putatively capable of being detected by means of a scientific instrument or experiment, this may well form the basis of a defeasible argument for realism concerning it. If, however, that same entity is putatively capable of being detected by not just one, but rather two or more different means of detection—forms of detection that are distinct with respect to the apparatuses they employ and the causal mechanisms and processes they are described as exploiting in the course of detection—this may serve as the basis of a significantly enhanced argument for realism (cf. Eronen 2015). Hacking (1983: 201; see also Hacking 1985: 146–147) gives the example of dense bodies in red blood platelets that can be detected using different forms of microscopy. Different techniques of detection, such as those employed in light microscopy and transmission electron microscopy, make use of very different sorts of physical processes, and these operations are described theoretically in terms of correspondingly different causal mechanisms. (For similar examples, see Salmon 1984: 217–219 and Franklin 1986: 166–168, 1990: 103–115.)