I was waiting for somebody to do this! Looks like they got it right and simple. Finally I'll get fine mobile text input :-) I wonder whether our sensory system

I was waiting for somebody to do this! Looks like they got it right and simple. Finally I'll get fine mobile text input :-) I wonder whether our sensory system would work well enough to use such a simple strip for the back-channel too. Maybe by contracting the holes by the same patterns? I guess it would work, given how fast people can read Braille.