[bianca]

I agree with Mykwyner.

The same is it with the way our facial expression, gestures and even posture harmonize with each other in an interplay with our emotional con(text) - so as to convey a genuine message.

I believe 'visual and audible harmony' refers to:

As with any perceptible things, even words have an image of their own, which can be perceived by our senses; visual, auditive. You can 'hear' if the word is right in/harmonizes with your context ("play it by the ear"). Having a visual image of a word also helps remember it better. Words are signifiers that convey certain aspects of meaning - just like with coins. Hear their clink as they collide, and you'll hear their meanings.