'Theatre' in the sense of the performance, rather than the place, has gone through many changes over the centuries, and since the latter half of the 20th century you might easily expect to see audience members seated on real bar furniture rather than the traditional red velvet theatre-style seating.
In the newly published Playing Offstage, Elizabeth Sakellaridou writes about the role of glass in modern performances, including one production that used one-way mirror glass to entirely enclose the performers in their own reflections, while still allowing the audience to look in on them.
Others place a realistic glass window between the spectators and the stage, giving the effect of looking in on a real-life household - a literal theatrical equivalent of the so-called 'kitchen sink dramas' seen in cinemas in the 20th century.
And in one case, a production of Yiorgos Veltsos' Empire by Michael Marmarinos, the play could only be performed at venues like the Tate Modern in London and the new building of the Concert Hall of Thessaloniki, which has a glass front wall looking out over a promenade and then the sea.
During this production, part of the play was performed outside on this promenade, while the spectators were indoors in the foyer, separated from this real-world 'stage' by the glass.
In this scene, an actor dressed in a suit was dragged outside and sat on a stool looking out to sea, with a child's helium-filled balloon tied to his left wrist and, on rainy days, an umbrella tied to his right - with no explanation given to real-world passers-by as to why he was sat on the promenade.
But another act took place in the upstairs bar area, with the actors using transparent chairs and tables to continue the glass theme and contrast with the normal bar furniture in the space.
With the spectators still sat in the bar, the actors slipped away one by one, assembling back down in the glass foyer in statue-like poses.
The production shows the impact and versatility of even a single piece of bar furniture like a stool moved out of its usual context, and the use of bar furniture even in its normal place as temporary audience seating - all of which could inspire you to host more amateur dramatics in your own establishment to see your premises brought to life in unusual ways.