Which principle of art helps an artist control which part of an artwork the viewer will look at first?

The principle of art that helps an artist control the viewer's focus is emphasis. By using techniques such as contrast, color, size, and placement, artists can draw attention to specific areas of the artwork. For instance, a bright color or a larger shape placed centrally can guide the viewer's eye to that focal point first. This strategic use of emphasis enhances the overall composition and conveys the intended message or theme.