Including the visual on its own terms 

Reading Culture (4th and later editions)
“We have also expanded the number of assignments that ask students to create their own visual compositions.”

Picturing Texts
“Ours is truly an information-saturated society, and much of the information we encounter daily is visual [...] Expectations about what it means to be literate have changed. Students today must be able to read and compose not only conventional print essays but also texts that combine words with images and other graphics. These texts are often highly visual in nature.”

Writing in a Visual Age
“New Technologies have transformed our understanding of what it means to compose. The design, formatting, graphing, and illustration tools available in the average word processor were unthinkable just a few years ago, and the options available for Web documents or Power-Point presentations are even more impressive. Not surprisingly [...] most writers today are expected to work with more than just words.”

Convergences
“Though you don’t absolutely require a visual, it will help draw attention to your ad. Research indicates that 70% of people will only look at the visual in an ad, whereas only 30% will read the headline. So if you use a visual, then you’re already talking to twice as many people.”

Making Sense: a Real World Rhetorical Reader
“And as with spoken or written words, their overall success depends on how well they balance considerations of purpose, audience, and situation.”

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my bold