This document discusses different types of lines that are foundational to art pieces. It describes vertical lines as perpendicular lines that carry the eye upward and make drawings appear tall. Horizontal lines are parallel to the horizon and lead the eye from left to right, connoting rest. Diagonal lines intersect at angles and can create illusions of energy or powerlessness depending on their direction. Curved lines suggest energy and movement while being non-angular. Zigzag lines appear jagged and can imply confusion. Lines are made through varying properties like thickness, scattering, circular shapes, and breaks.