The “ice line” is a term used in the planetary sciences to refer to a boundary in planetary systems beyond which volatile substances (including water) are able to freeze into solid form. The processes and conditions that are generated in relation to this boundary (which marks a point of distance from the Sun, or a central star), are implicated in the very ability of planets to come into being, as well as their potential habitability. Metaphorically, then, the “ice line” operates as a point of distinction between what is possible and what is not; what exists, and what does not. We reimagine and think through this boundary in our film The Ice Line, an experimental non-fiction work that draws on archival memory, satellite data, interviews with scientists, poetry, audio and audio-visual recordings of sea-ice (from an active partnership with the Australian Antarctic Division), and speculative imaginaries composed by artists and fiction writers – to explore our rich and evolving relationship to ice over time and into the future.