Final answer:
Color is considered the most vivid and complex element in art and design, influencing human emotions and guiding artistic expression.
Step-by-step explanation:
The most vivid element of art and design is color. Color stands out as the most complex artistic element due to its wide range of combinations and the various responses it can evoke in humans. Artists meticulously study and apply color to guide viewers' emotions and interpretations of their work, capitalizing on color's powerful influence in art and design. The elements of art include color, form, line, shape, space, texture, and value, all playing pivotal roles in the composition of an artwork. Yet, it is color that often catches the eye first and can hold a viewer's attention, thereby earning its place as the most striking element.