Metal and clay: prototype and re-creation. Zoffany''s ''tribuna'' and lessons from the Malacena fabric of hellenistic volterra (calyx-krater, stamnos, situla and the achaemenid rhyton): prototype and re-creation. Zoffany''s ''tribuna'' and lessons from the Malacena fabric of hellenistic volterra (calyx-krater, stamnos, situla and the achaemenid rhyton)