Sorry Lydart and Paul, but I've got to disagree. I'm actually a stage technician (hence my intrigue with the lighting in the photo too!) and to me, it's far too involved for a stage set. There is too much furniture and not enough acting space, especially for two or more characters. It would make for an awful acting area and I doubt there is much room behind the photographer for the audience and even if it went back farther, it would be very narrow. If it was a little production for friends or family, then I doubt anyone would go to these lengths to create a set like this!
I'm assuming of course that the play is performed in this room and that the room hasn't been built in a larger space, which is even less likely given the ornate ceiling.
This said, a stage set would be a good reason to take the photo - I would be proud of a set like that!
Hadyn