In response to Dave McCandless' post on Data, Information, Knowledge and Wisdom:
I would say that the value visualization brings is not only design but also analysis. First, you must analyse the information, and then you have to communicate that analysis to others. You can generate a very well designed pie chart, but if the useful analysis is better done with a bar chart, you’ve missed the best visualization. That’s why you get mush – not because the design is missing, but because the analysis is.