  Ice-templating is a simple materials processing and shaping route where the
growth of crystals from a solvent template the porosity. Although the
principles of ice-templating were established a long time ago, it has lured
considerable attention over the past 5 years to become a well-established
processing route for porous materials of all kinds. In this viewpoint, I
summarize the current status and recent trends of ice-templating studies. I
then review the unique assets of ice-templating and propose a roadmap of the
most promising or pressing questions and opportunities in this domain.
