Answer:
Contour lines
Step-by-step explanation:
Contour lines are lines that follow the edges or outlines of the subject, creating curves or undulating patterns. They are commonly used in art and design to represent the three-dimensional form of an object or landscape. By using curved, parallel lines, contour lines can add depth, dimension, and visual interest to a design. These lines essentially trace the contours of the subject, emphasizing its shape and structure.
In contrast:
Hatching: Involves the use of parallel lines to create shading and texture.
Cross-hatching: Utilizes intersecting sets of parallel lines to achieve shading and tonal effects.
Stippling: Involves creating patterns using dots rather than lines.
While all of these techniques can contribute to the visual interest of a design, the specific mention of curved, parallel lines aligns most closely with the use of contour lines for emphasizing form and structure.