Everybody knows how an important part of writing is the ability to compose proper dialogue. I've even heard that publishers tend to jump to the first conversation in a received draft and see if it works. This makes sense to me as nothing sets a reader further from the story than unnatural dialogue.
There are plenty of videos, articles and even questions on this site covering the topic. They usually focus on making characters' speeches organic. People often wonder about hero's lines presenting their personality or how to make them unique.
One would also easily find texts regarding the flow of dialogue. About the hidden conflicts and pushing the action forward. How they impact the plot.
In other words there is a lot of coverage of actual words being said in dialogue.
I have concern about another part of the matter: the background. The didascalies. The description of the second plan.
It comes from self-analysis of my own writing. I've noticed that in my stories conversations tend to have a repetitive setting. They usually happen at a coffee shop or in a park. Characters sit, eat or walk. It all comes from my own experiences as I tend to chat in such circumstances.
While writing I always try to expand the actual meaning of a dialogue with descriptions. A person being nervous will spill some wine. Characters having some mystery would hide their hands. A guilty individual can point a finger at himself.
I'm starting to feel though like I wander around a very small room, if it makes any sense. Following the aforementioned settings, it seems like all of my dialogue is the compilation of finite and quite small pack of activities. It's like I have a bunch of metaphors, all surrounding benches and tables, and I use them over and over again.
At this point I want to break out of this limited room. I would like my dialogue to vary as far as my imagination can reach. I want to use symbolism that is unique to the scene. I want each of my dialogues to be a fresh story.
I hope that makes sense to you. Thank you for reaching the end of my question and if any advice or thought comes to your mind, please share it.