Back to the Future explores the relationship between humanity, the city, and nature through the visual language of lines. Beginning with observations of everyday environments—from pedestrian movement and architectural structures to trees and the trajectory of the sun—the project distinguishes between static and dynamic lines and transforms them into a graphic system. Through publication design, typography, illustration, and digital applications, the project reinterprets familiar landscapes as a “line world,” where past, present, nature, and urban life converge.