I swear I actually had this idea about four years ago! Ok, I probably not the first to think of it BUT… wouldn’t it be wicked if a smartphone had an adaptable surface which changes depending on what screen you’re on, this way you can have tactile feedback on a touch screen device. Maybe they could work like a Pin Point Impression but using smaller more detailed pins…
I just came across this, which could be the closest we have so far… (click the image to find out more)
SUPERBEAT 