Horizontal lines are straight lines that run from left to right, parallel to the horizon. They do not rise or fall, maintaining a consistent level across their length. In geometry, horizontal lines are often used to represent stability and calmness, as they create a sense of balance in visual compositions. In art and design, horizontal lines can guide the viewer's eye and create a feeling of spaciousness. They are commonly found in landscapes, such as the horizon where the sky meets the ground, and in architecture, where they can emphasize the width of a structure.