Lines are the source of graphics and often are specific to each designer. These “pull” a composition or series of compositions together as a unifying theme.

Taking a step back, a line is the simplest form of divided, or with multiple lines, enclosed space. A line delineates, and creates an edge. Lines also relate to the context of the medium, its range and extent, of the two-dimensional frame in which they rest. If we consider that the eye is invariably attracted to an edge condition, then lines become critical in design and color.

Lines are thought about in two different ways when drawing with the hand as opposed to the computer. Lines are the building blocks for creating space and translate into planes, where edge conditions and color separation may be important to lead the viewer in a certain direction. Graphics lines, color, and graphics show an image to the viewer, its detail and effect are yours to decide,

In the principle of interposition that Albers and Klee explored, using fields (Albers) and lines (Klee) depths can be created or rejected based on position. This concept of proximity and position to create or deny space and depth will be critical to understanding color and its resulting effects.

Here is an example of figure-ground and how graphics can create depth and space.