We report here on an ongoing study of a self-defining community of physicists whose work spans an interestingly diverse set of subjects, typically in the borderland between macroscopic and microscopic description and between quantum and classical domains. Its methods are typically semi-classical. It is this borderland—of people, subject, and methods—in which we are primarily interested and which we will attempt to characterise. For concreteness, we will focus on the subset of ‘quantum chaos’ and more particularly on the work that the (...) physicists Eric Heller and Steven Tomsovic have called ‘postmodern quantum mechanics’, using their characterisation to ground a somewhat more expansive interpretation. (shrink)