This document discusses the element of line in design. It defines line and describes the different types of lines including straight, curved, diagonal, and zigzag lines. It explains that lines can be either structural, which are necessary for construction of a garment, or decorative. The document also explores how different line placements and types can create various visual effects and illusions, as well as convey different meanings and moods such as masculinity, femininity, movement, and calmness. It encourages preparing a design portfolio analyzing line placements and their effects.