In February, I visited the Metropolitan in New York and saw this magnificent Faience masks found in Medinet-el-Fayum at Antinoopolis, Middle Egypt. It dates from the 2nd century AD. With reference to the The Met, the masks are too small and brittle to have served as actual theater masks. They refer to the god Dionysus, patron of the theater and god of rebirth: in Egypt he was equated with Osiris.
Terracota masks are found in burials and sanctuaries in Greece, in sanctuaries and as garden decorations in Italy.
In Egypt, they are known only from burials, as offerings to Osiris, Dionysus.
More of my pictures of the Metropolitan can be seen here.