This was a very interesting picture that I found also on GraphJam. It is a physical visualization. Professor Olson showed us some of these in class, such as the physical visualization wherein a ball appeared to roll up a hill because of the angle at which the camera was situated. I actually thoroughly enjoyed this graphic. It shows the data which it wishes to represent: the frequency with which letters on a keyboard are pressed. It is very simple so the viewer is induced to think about the substance of the data. The data is not distorted. It follows Tufte's Principles. Cool graphic.
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