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Sky and Water I (1938) strange and at the same time comprehensible? Isn't it a “view cell” given by the artist to scientists, particularly those interested in this dossier? The air and water creatures that inhabit Escher's lithography evoke the physical properties of the fluid state, gas and liquid being its extreme forms. Escher is able to overlap them in the same environment, showing no boundary between sky and water and creating a milieu where birds and fish are able to cohabit, combine their attributes, increase their ability to occupy the space, even going beyond the frame. Similarly, pressure raised above the atmospheric value can generate supercritical fluid (discovered in 1822), eliminate the boundaries between gas and liquid, combine the best properties of these common forms, broadening their application range (perhaps beyond what we may imagine today), particularly in the field of chromatography where this “general” fluid state was implemented for the first time in 1962.

Towards a better awareness of the advantages of supercritical-fluid chromatography