The phallic vessel insula occupies a long extension along the city's main street, a block whose irregular shape was certainly dictated by the pre-existing cadastral that the Romans found and which did not change substantially except for the large public buildings in Flavian. It is therefore not completely clear whether the insula's subdivision into at least five distinct sectors corresponds to a purely technical solution or whether we are facing several constructions taking advantage of sharecrop walls. The state of conservation of the structures, which is very deficient, may never be able to resolve this issue.