 Since Borbein's publication, researchers have mainly devoted themselves to chronological aspects or the preparation of catalogues of material from recent excavations and publications of old collections.In 1999 Marion Rauch produced an iconographic study "Bacchische Themen und Nilbilder auf Campanareliefs" ("Bacchic Themes and Nile Images in Campana Reliefs") and in 2006 Kristine Bøggild Johannsen described the usage contexts of the tiles in Roman villas on the basis of recent archaeological finds.She showed that the reliefs were among the most common decorations of Roman villas from the middle of the first century BC until the beginning of the second century AD, both in the country houses of the nobility and in the essentially agricultural "villae rusticae".