Researchers have observed the formation of non-equilibrium stratification in supercritical carbon dioxide (CO2), a state of matter exhibiting properties of both liquid and gas. This finding is significant because it contradicts the expectation that supercritical fluids, lacking a clear distinction between phases, should mix uniformly under non-equilibrium conditions. The observed stratification implies that, even in the absence of discrete phase interfaces, complex and persistent structures can emerge in these fluids.