Sometimes you simply need to make notes in your forearm. Put that permanent marker down though, because PhD student Chris Harrison et al at Microsoft Research have created a brand new system that permits touchscreen interaction on hairy and uneven surfaces. It uses a brief-range depth camera rather than the infrared sensor we have seen on similar devices , which permits it to gauge the viewing angle and other characteristics of surfaces getting used — and it could actually even handle pinch-to-zoom. There is a video after the break, in case you fancy just a little wall-based digital finger painting.
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