What design technique strengthens the element of line and moves the eye through the arrangement?

The design technique that strengthens the element of line and effectively moves the eye through an arrangement is the parallel design. In floral design, parallel design utilizes a series of vertical lines arranged either closely together or at specific angles to create a sense of movement. This technique emphasizes the linear elements, guiding the viewer's eye along the lines, which contributes to a cohesive and dynamic visual flow within the arrangement.

By focusing on vertical orientation and maintaining a rhythmic connection between elements, parallel design not only enhances the aesthetic appeal but also reinforces the concept of line, making it a powerful technique in floral compositions. In contrast, other design techniques like cluster, textural, and geometric designs may emphasize different aspects such as groupings, textures, or shapes, but do not specifically target the movement of the eye through the illusion of lines in the same way that parallel design does.