Emphasis is what makes part of a composition stand out. Artists and designers can emphasise something by altering its position or using converging lines
Placing something in a central position will help emphasise it because our eyes tend to be drawn to the middle of a composition.
Seated Girl (Amadeo Modigliani, 1918) is a very simple example showing how placement can help draw our attention to a subject.
The girl is centrally positioned in the frame. The fact that there is very little other detail in the painting helps ensure she stands out against her plain surroundings.
Emphasis can play an important functional role in architectural design. In Peter Behren鈥檚 Haus Cuno (1907-10) the central position of the main entrance draws our attention to it and makes it easy to find.
The strong vertical lines of the curving window frames above also help lead our eyes down to the doorway.