Dynamically Changeable Physical Buttons on a Visual Display

One can be easily impressed with large-scale projections, single-touch screens, multi-touch mobiles (think iPhone), interactive tabletops and the like. However, while such screens allow for “virtual” buttons and keyboards to be popped-up, panned and rotated anywhere, they lack obvious low-attention and vision-free tactile qualities. Instead, they require continuous visual attention to know *where* to press or click.