The archaeological excavations across the world provided over time abundant evidence about the exploitation of salt water (sea water or inland brine), transformed into solid salt by means of a forced evaporation process involving the use of fire and clay containers, known as briquetage type vessels. Quite strange at first sight, regardless of age or location of salt making sites in the world (Neolithic, Chalcolithic and Iron Age in Poland; Chalcolithic and Bronze Age in Romania; Bronze Age and Iron Age in France, Germany, England; Bronze Age and Iron Age in China and Japan; even modern times in some areas of Africa), there is an affinity for the quasi-conical shape of the ceramic vessels used to obtain salt units. This paper examines adaptive convergence in briquetage-making, cases in which functional constraints result in similar forms in independent lineages.