The idea is pretty simple (and somewhat general): create an application that provides physical feedback when interacting with virtual objects. Physical feedback may consist of visual (LEDs), sound (sequence of musical notes), haptic (tactile, stylus, vibration motor etc.), smell (although hard to implement) or taste (still hard to implement). Examples where such application could be developed: medicine, games (some applications exit: kinect, wii, PS3, NGP), education, engineering (engine, car building etc.), etc.