Final answer:
The question discusses visual arts techniques such as the use of contour lines, motion representation, texture, and color contrasts to create form, movement, and composition in artwork. The contrast in numerical chart representation also emphasizes visual distinction and information presentation.
Step-by-step explanation:
The question pertains to the techniques used in visual arts to depict motion and the sense of form. The use of contour lines is highlighted as a critical element in creating the illusion of shading and form within an image. These lines define the edges of figures and can suggest three-dimensionality. When accompanied by background elements such as horizontal lines, they can also imply motion, as seen in the example where riders are depicted as moving rapidly from left to right. Moreover, the description of the secco technique, which involves painting on dry plaster with a combination of oil and tempera that does not blend well, is mentioned to discuss the textures and color contrasts in art.
Additionally, the strong diagonal lines formed by fences and a slash of green suggesting a stream are noted for their role in guiding the viewer's eye across a scene, as in the case where they lead to a figure on a white horse. The color contrasts, such as the green grass seen through a window and the usage of blues and purples, are mentioned as well, recognizing their importance in the overall composition.
Finally, an analysis of a chart with numerical data is brought into context, which contrasts darker blue numbers with lighter blue bars, along with black font, to present information visually.