Principals of Two-Dimensional Design. Point, line, and plane are conceptual elements that are not visible. Thus when visible, they become form. A plane on paper, however small, must have shape, size, color, and texture if it is meant to be seen. So must a point and line.
Volume remains illusory in two-dimensional design.
Principals of Two-Dimensional Design. A plane may be flat or curved, opaque or transparent, may exist in a drawing or a painting, or it may be the very real surface of a physical object. Whether solid, open, or transparent, planes are capable of activating the space around them or through which they appear to move, of setting up currents of movements in all directions. When the bounding lines are straight, the figure is rectilineal. I include these dictionary definitions of the plane to indicate that most thinking about the plane and planes is in geometrical terms, although one or more recent dictionaries distinguish between mathematical, fine arts, aeronautical, and architectural applications.