The tragic plot requires a rigorous, internal chain of cause and effect. There are four necessary elements to a tragedy: Hamartia: the tragic hero makes an error and starts a chain of events. Peripeteia: reversal, the tragic hero falls from a lofty position. Anagnorisis: recognition, the tragic hero realises their situation. Catharsis: purgation, the audience experiences an emotional purge. All tragedies should involve three unities: unity of time; unity of place; unity of action. Theatrum Mundi, a character describing life like theatre, is important