Here you are a “deductive-image”. It depicts the Appalachian mountain range by using only individual road segments. Expressive result taken from “All Streets“, an interesting project by Ben Fry.
“All of the streets in the lower 48 United States: an image of 26 million individual road segments. No other features (such as outlines or geographic features) have been added to this image, however they emerge as roads avoid mountains, and sparse areas convey low population.”