This document discusses the elements of design for people. It describes the main characteristics of lines used in design, including thickness, species, straightness, saturation, and curvature. It outlines several functions of lines in design like creating a backplane, separating elements, and accentuating parts. The document also discusses using lines to convey emotions and explores different styles of line-based design exemplified through images. Finally, it provides exercises for the reader to practice different line-based composition styles and explores using shapes and rhythm in design.