the realistic nature of the play was supported by Ibsen's adoption of concepts outlined by the Greek philosopher Aristotle (384-322 BC) in his Poetics. Aristotle's classical 'unities' demanded that a drama should have only one plot, which should take place in a single day and be confined to a single locale. The events of A Doll's House cover about 60 hours (not the 24 stipulated by Aristotle) and are confined to a single locale, the Helmers' apartment. These factors create a sense of reality and place an almost claustrophobic focus on the characters' psychology within a confined space, intensifying the sense of restraint and repression defined by the plot.