http://www.psfk.com/wp-content/uploads/2009/08/eartheye.jpg
REPRESENTATIONAL: What this visual communication design is representing is the eye of a person.
The role that it plays in the whole is that it provides a relevant image for the viewer to work with.
The impact that it has is that the viewer sees and/or recognizes the overall image from his/her environment and/or experience.
It relates to the other two levels by providing the canvas for the other two levels to emerge from.
SYMBOLIC: What this visual communication design is symbolizing is the earth.
The role that it plays in the whole is that it's the subject of the overall image.
The impact that it has is that it communicates via shared, coded forms, in this case portraying a globe.
It relates to the other two levels by having the opportunity to elaborating more from the previous level and providing a subject for the next level to work with, the pupil.
ABSTRACT: This visual communication design is portraying the earth in an abstract way.
The role that it plays in the whole is that it has the kinesthetic quality of a visual event, earth in space, reduced to the basics.
The impact that it has is that it generates a direct and emotional response to the image itself.
It relates to the other two levels by tying/completing the image together to form a statement.