This type of clay vase, particularly common in the Cyclades and the Greek mainland in the Early Bronze Age, owes its conventional name to its characteristic shape and not to its use, which remains enigmatic. The interpretations proposed for their use vary considerably: ritual vessels for libations or offerings to the dead; containers for cosmetic objects; drums for funerary rituals; mirrors; navigational instruments; plates for food; symbolic vessels emphasizing the relationship between natural elements (sun, sea) and female fertility.