Keyboard whose keys are raised in proportion to their frequency of use

Mike Kneupfel, a student at NYU's Interactive Technology Program, made a 3D model showing the keys he presses most frequently when typing, composed of raised keys on a keyboard. It's a fun and eye-catching way of visualizing data by using the thing whose data you're analyzing.
Conclusions - This was just a first go at trying to create a data driven 3d sculpture. I wound up scaling the keys a little bit too much in the vertical direction. The weight of the tall keys caused the towers to tilt at an angle. I plan on showing this prototype to a few people that will hopefully give me more ideas for new data sets to look at. I want to try and use the CNC for future data driven sculptures. I also want to try and include color into the sculpture somehow.
Keyboard Frequency Sculpture (via Neatorama)