A contour line is a line on a map that connects points of equal elevation above a specific reference point, usually sea level. These lines help visualize the shape and steepness of the terrain, making it easier to understand the landscape's features. When contour lines are close together, it indicates a steep slope, while lines that are farther apart suggest a gentler incline. In addition to topographic maps, contour lines are also used in art and design to create outlines and define shapes. They can represent the edges of objects and help convey depth and dimension in a two-dimensional space, similar to techniques used by artists like Pablo Picasso.