Correct me if I'm wrong, Faction, but here's the gist:
Our Town, written by Thornton Wilder is known for not using props or stagecraft. In more and more plays you see props/stagecraft, so when Wilder removes them he needs something to replace them. So he uses dialogue. In 3 acts, he shows the focus of the play through the characters' speech, gestures, and through themes. Through using these methods, he approach the play in a way that seems much larger than it is, without props. In that way, it can reflect on our world.
Eh...it was really tough to substitute in "dumb" words.