After having promoted and then tacitly abandoned the rhetoric of postmodernism, Zygmunt Bauman settled on the metaphor of a modernity that was growing more ‘liquid’ and ‘lighter’ than before. This essay explores the strengths and weaknesses of these metaphors, and attempts to contextualize Bauman’s insights in what has been called by the historian Yuri Slezkine the ‘Mercurian’ culture of diasporic Jewish life.