What lines is not likely to appear on a map?

Lines that are not likely to appear on a map include subjective or abstract concepts like "happiness" or "discontent," as these cannot be physically represented in a geographic context. Additionally, ephemeral lines such as the path of a fleeting event (like a parade) or personal routes taken by individuals are too transient to be captured. Lastly, lines that represent non-physical boundaries, like social or cultural divisions, typically do not have a defined geographic representation on maps.