Here's something you don't see everyday. Mike Kneupfel, a student at NYU's Interactive Telecommunications Program, came up with a visual way for users to gauge the frequency of the letters used most often on a keyboard. Seeing this really shows how often we input certain letters over others. Why, in the previous sentence alone, the most repeated letters were e and t. Even I'm participating in this experiment and I don't even know it.
Using Wikipedia's letter frequency graph, Mike utilized his skills in 3D data visualization to prototype a keyboard with actual usage metrics. In the video below, you can see how the keyboard proves its functionality by allowing the user to click on the keys themselves. A bit Leaning Tower of Pisa-esque due to the weight of the pillars, but still super cool nonetheless.