This is an experiment by DS-Labs (a bunch of designers at Teague), same collective that brought you DIY Soft iPhone and iPad Stylus. What I find especially interesting is that although quite limited, this little experiment actually provides a very good insight of what is yet to come. Whilst touch screen tables such as Microsoft Surface or many more incorporate camera so are able to recognise objects that are located on the surface (reacTIVision), iPhone and iPad do not have a camera so they purely rely on a touch input. This experiment demos physical knob used instead of a finger which suggests interesting possibilities for how application may behave or be designed for the platforms. Although this is a simple rotary input interface demoed to rotate a map. Combining this with some smart software it could get very interesting. I think a lot of people fail to acknowledge that the future are NOT touch screen devices but those that combine both the physical and touch input, thus 'Physical Touchscreen Knobs' gets 10 points from me. See video below.