Greasy-finger enabled heatmaps for iPad
Taking all these greasy little fingerprints as a source of information is a great idea, and the photos George Kokkindis took have their own beauty (I wonder is the iDraft image a self-portrait ;-)?).
Interestingly, the results mirror heatmaps that are often generated to analyise websites with expensive eyetracking tools. You can even sense how much pressure is applied to individual areas on the screen.
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