[not] + [you] -- 3x2 matrices
Louis Braille made the 3x2 matrix the cornerstone of his new writing system. There are practical reasons for this choice. Each position can either contain a dot or remain empty, so 6 positions gives 2^6 - 1 = 63 nonempty configurations. This is enough for the 26 letters of the alphabet, with plenty of room left over for special characters. The 3x2 matrix (tall and skinny) also fits naturally on the pad of the finger. A 2x3 matrix (short and fat) is not able to be comprehended by a single touch, and strings of long horizontal (1x6) or vertical (6x1) lines blur together. 3x2 is both the correct size for the data it must hold and the most ergonomic option.
Interestingly, 3x2 is also the size of an English, Latin, or Greek verb’s conjugation matrix.
Braille shows that 3x2 is the ideal shape for encoding linguistic information. Another post argues that the verb is the primary element of the sentence. You can delete everything else, but if the verb remains (e.g. Run!) a sentence remains. It is entirely fitting that the verb’s schematic should embody this sort of optimality.