Pirandello "s savage comedy from 1921 reflects the warp of European reality after World War I and advances his philosophical argument that reality is never a rock certainty, only a subjective creation. Following on his brilliant adaptation of Six Characters in Search of an Author (also published by Ivan R. Dee), Robert Brustein "s script for Enrico IV Sadopts a modern idiom with graceful unobtrusiveness (New York Times).