 The title of the play "Emerald City" has been used as a frequent moniker and nickname for the city of Sydney ever since the play was first presented.The title has been attributed to Brett Sheehy who was Sydney Theatre Company's Literary Manager when the play was written and first produced.The play's director Richard Wherrett recalls in his autobiography "The Floor of Heaven" that Sheehy suggested 'Emerald City' as the title, which Williamson accepted, adding the line of dialogue, "The Emerald city of Oz.