David Huckvale, a lecturer at the Open University and broadcaster for BBC Radio, said the designs of the Tree of Woe and the costumes appeared very similar to those used in Richard Wagner's Ring of the Nibelung operas at the Bayreuth Festspielhaus in 1876.
David Huckvale, un conferenciante na Open University e locutor na BBC Radio, dixo que os deseños da Árbore de Woe e o vestiario eran moi semellantes ós empregados na ópera Der Ring des Nibelungen de Richard Wagner representada en Bayreuth Festspielhaus no ano 1876.