Plane:

A plane can be thought of as a series of adjacent lines. Simply by adding another dimension called breadth to a line we can define a plane. But planes are abstract objects, in the actual world they do not exist. It is bounded by lines.

Volume:

It is empty space defined by planes, lines, and points. It has position in space and is bounded by planes. In two-dimensional design, volume is illusory.

Fig.115 : Volumes

Visual Elements:

When we draw anything on a paper or any other surface we use a line to represent a line which is conceptual. The visible line not only has length but also has breadth. It tends to have other features too like color and texture which is defined by the materials we use to draw the line. Thus when conceptual elements become visible they have the following properties .These are the visual elements what actually we see.

Shape:

When we come to see a visual element or a combination of element's outer contour, our brains try to establish some identification of that combination. Anything that can be seen has a shape which gives us a basic understanding of any combination of visual elements.

Fig.116: Shapes .