Imagine if you could attach a physical knob, slider, or switch to any application which called for some tactile interaction (say a music app like Live or Logic). That concept is exactly what led Lyndsay Williams to create the SenseSurface -- a modular system that allows you to literally
stick a controller onto a display when you need it. The devices use an X/Y matrix on the backside of a typical laptop display coupled with custom designed movement sensors. Lyndsay claims that the apparatus is multitouch and low friction, leaves no marks, is programmable, scaleable, and limited only by the size of the screen. The cost? Less than $100 in production. Take a look at a prototype of the system on video after the break, and hit the read link for more detail.
[Via Boing Boing Gadgets