The National Theatre of Scotland's 2012 production of Macbeth was almost one-man performance by Alan Cumming, performing in Glasgow and at the Lincoln Center Festival. The production transferred to Broadway in 2013.
Alan Cumming plays almost all speaking parts, re-enacting the action of the play while under observation in a hospital ward by two silent orderlies and surveillance cameras. The cameras are part of the set, ominous and highly visible to the audience, and occasionally used as additional characters. Because of this, the cameras were chosen for their looks rather than their functionality, and we had an alternate build of Catalyst supplied to control them via Serial.
In addition, there was a great advantage to the idea of a human being 'observing' the character and controlling the cameras manually, so we developed an iOS application to control all three cameras by touch, allowing certain cues to look 'operated'.