Agreed it would be impressive. And quite strange, if a vibration on the whole surface had the same effect as an actual physical change ona specific part of the

Agreed it would be impressive. And quite strange, if a vibration on the whole surface had the same effect as an actual physical change ona specific part of the surface, just because that's where your finger was when it vibrated. (Reminds me of arthur dent, zapped to the RatEotU, encountering pain where-ever he touched his body, and eventually realizing it was his finger that hurt). I wonder, if it responding fast enough, you could brush your finger across it, and it would feel like there was a pattern on the surface (by it vibrating/not depending on where your finger was)... Sort of a zero-dimensional display. Of course, wouldn't work for multi-touch (though the haptic patent does seem to manage this, by creating a waveform whose peak is sharply localized).