visual rhetoric- where is it? what does it look like?

Visual rhetoric	If rhetoric is the art of communicating effectively and persuasively, it stands to reason that communicating visually can be as much an exercise in rhetoric as communicating in writing
Photographs	•   use composition lines, contrast, and colour to establish relationships between people and objects.
Political cartoons	•   use exaggeration to emphasize traits of characters and symbolism to communicate concepts and situations in a compact way.
Paintings	•   use colour and symbolism, and may often use allusion to tell a story about their subjects
Posters and advertisements	•   use color and composition to attract attention, and symbolism and imagery to persuade
Graphs and charts	•                select sets of data and present them in a manner that makes them easy to interpret, sometimes showing trends or contrasts.