Matching Pairs Design Elements #1Online version Test your knowledge of the basic elements of hair design. by Rosalind Carter 1 curved lines 2 directional lines 3 diagonal lines 4 vertical lines 5 parallel lines 6 Horizontal lines 7 Transitional lines 8 Contrasting lines 9 single lines horizontal and vertical lines that meet at a 90-degree angle. Move in a circular or semi-circular direction. Often used to emphasize or minimize facial features. Repeating lines in a hairstyle. curved lines that are used to blend and soften horizontal or vertical lines. Lines with a definite forward or backward movement. create width in a hairstyle. Used in the one-length hairstyle. Create length and height in hair design.