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