I was talking to a piano teacher who had been offered to teach a blind boy and she was telling me about the difficulties and challenges that would be associated with such an endeavor. The solution to most of these problems is labeling the keys which is what this design does.
Each piece has 3 components, the base, the octave (the O files 1-7) and the key (the k files A-G). The O and K files have braille that indicate the octave and key respectively according to braille music notation. The O and K files need to be glued to the 'base' with the braille closest to the center to conform to standard braille format.the completed piece slots between the the keys of most post-1900 pianos.
All the files are fairly small so they can be printed at 100% and they should be printed at a high resolution so that the braille is easy to read.