In responding to Muhsin al-Musawi’s two-part essay on the Arabic Republic of Letters, this essay proposes a rethinking of the world systems model in global literary studies in terms of a polysystems framework. Rather than trying to fit literary worlds—ancient, premodern, modern—within a single Euro-chronological frame culminating in a world capitalist systems model—where the non-European worlds appear as invariably inferior—it is worthwhile to see them as several polysystems with variable valences within a heterotemporal planetary literary space. This approach offers a comparative reading of the emergence of three language worlds—Sanskrit, Persian, and Arabic—and urges us to rethink the totality of the world literary space as a diachronic field that generates overlapping, multiscalar, comparative histories of literary polysystems.