In testimony of that Romanesque precursor, the "Eselsturm" ("donkey tower") still stands on the north side of the cathedral; it was used in the past and is still used to transport construction materials to the upper levels. A pulley remains in the west loft, and with it materials were lifted through an opening in the ceiling near the west portal. To the east of the cathedral is the state-run "Dombauhütte" (cathedral building workshop) which is responsible for the preservation of the structure. In contrast with many cathedral building workshops, neither modern machines nor exclusively old tools are used. Rather, tools are manufactured in the workshop itself.