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I wish the keycaps on some of the keys on my keyboard were textured - I can touch-type well enough for the alphabetic keys, but when using other keys, I often get slightly confused as to which keys are under my fingers unless I use my eyes to see what key it is. If there were textures (perhaps braille symbols) that indicated which key I was feeling, I expect that would be useful.
I tried this once -- I got Braille stickers designed to put on a keyboard -- but I didn't like it. Still, it would be pretty cool to learn braille this way.
1MikkW
This is useful data. What didn't you like about it?