From “A Brief Rant On the Future of Interaction Design,” a really smart illustrated essay by Bret Victor about, among other things, the limitations of the touchscreen:

“I believe that hands are our future.

So then. What is the Future Of Interaction?

The most important thing to realize about the future is that it’s a choice. People choose which visions to pursue, people choose which research gets funded, people choose how they will spend their careers.

Despite how it appears to the culture at large, technology doesn’t just happen. It doesn’t emerge spontaneously, like mold on cheese. Revolutionary technology comes out of long research, and research is performed and funded by inspired people

And this is my plea — be inspired by the untapped potential of human capabilities. Don’t just extrapolate yesterday’s technology and then cram people into it.,,Our hands feel things, and our hands manipulate things. Why aim for anything less than a dynamic medium that we can see, feel, and manipulate?” (Thanks Browser.)

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Monkey with touchscreen playing Angry Birds: