 A somewhat different sort of two-levels position is the “historical ontology” of Ian Hacking. Hacking (2002, 2012) cites Foucault’s “discursive formations” (epistèmes) and Alistair Crombie’s “styles of scientific thinking” (Crombie 1994) as inspirations. Examples of such styles are the Greek discovery or invention of axiomatic geometry, the laboratory science that emerged in the Scientific Revolution (Shapin &amp; Schaffer 1985), and modern probability theory and statistical inference (Hacking 1975). Hacking returns to Kant’s “how possible?” question, the answer to which establishes the necessary conditions for a logical space of reasons in which practitioners can make true or false claims about objects and pose research questions about them. And Hacking also historicizes the Kantian conception.