Braille - as I see it!
The Braille square
10 patterns of dots
Creating the letters
Developing the invention
Those ten letters are Louis Braille's invention. It must be understood that although it is a brilliant idea, it is not the final thing with everything in its final position. Extension and modification are needed to bring it to its full usefulness.
Though no-one knows how Braille found his first 10 letters, it is obvious to anyone how he got his next 20. He simply added one dot to each of the first letters to get 10 more and two dots to them to get another 10.
In the invention discussed here, the single dot A is located at (2) whereas its ultimate position is (1). This ought not be seen as a point of conflict, but rather an example of how a basic invention is modified or developed to extend its usefulness.
Consider the situation of adding an extra dot (3) to each of the 10 letters of the invention. Of the 10 new patterns, everything works fine except that one of the patterns duplicates a pattern already existing in the invention. The new pattern (2,3) is indistiguishable from the letter B (1,2).
Clearly, a duplication is not permissible and a modification is needed. The remarkable thing is that the solution of this problem proves to be so easy, only requiring to move the A from location (2) of the invention, to a new location (1). No other changes are necessary.