The supporting material is called an extended example.
Explanation:
An extended example may be a narrative or way of supporting your argument in your speech. For instance, when you are telling a story and you need to strengthen or to reduce the complexity of some certain concepts. You can use a personal story or a narrative to strengthen and clarify your ideas, while in the same vein you are also making a personal connection with your audience.
What i would do if I was presented with the task of creating art in
a public space would be to create a wonderful piece of Graffitti I would display it on the Old wall somewhere in the middle of a town where everyone could enjoy it
