My binary grid is 2 wide and 3 high; similar to a braille cell.
11
10
00
…in braille this is the letter “F”. In competitions it’s my image for 31 putting one PAO (i.e., 2x3 = 6 wide) per location. That then is 5 loci per row.
Has the advantage that PAO images don’t spill over into the next row as they would if you did 6 digits at a time (i.e., 3x6 = 18 binary digits per PAO). Also, it keeps the same way of reading when reading braille or encoding letters of unknown words or codes into braille: