On the Physical Meaning of Parallel Lines

This preprint examines the concept of parallel lines from a combined geometric and physical perspective. We argue that strict parallelism is not a fundamental property of physical space, but a limiting case that emerges under conditions of negligible curvature and weak interaction. Using the language of modern physics, parallel lines are reinterpreted as approximately parallel geodesics whose global relationship is not preserved in curved or field-dominated environments. The analysis clarifies the role of Euclidean geometry as an effective approximation rather than a universal description.