Historically speaking, the majority of efforts in the study of ancient Greek physics have traditionally been devoted either to the analysis of the surviving evidence concerning Presocratic philosophers or to the systematic examination of the Platonic and the Aristotelian oeuvre. The aim of this volume is to discuss the notion of space by focusing on the most representative exponents of the Hellenistic schools and to explore the role played by spatial concepts in both coeval and later authors who, without specifically thematising these concepts, made use of them in a theoretically original way. To this purpose, renowned scholars investigate the philosophical and historical significance of the different conceptions of space endorsed by various thinkers ranging from the end of the Classical period to the middle Imperial age. Thus, the volume brings to light the problematical character of the ancient reflection on this topic.