arranged arrangement as-figure-six-on-a-die basic blind braille-alphabet braille-character-set braille-codes braille-dots braille-font braille-punctuation cell characters chart configurations enabling French-teacher grid internationally-standardised letter-substitution Louis-Braille partially-sighted patterned patterns positioned positions raised-dots sightless six-dots tactile textured textures three-dimensional-tactile-bumps touch two-parallel-vertical-lines-of-three-dots Unicode vertical vision-impaired writing-system book braille finger letter page paper pattern read Scripture texture word alphabet closeup communication dot hand learn lesson literature text black side wave white background bumps city crosswalk feel San Francisco sidewalk street surface urban warn warning yellow aluminium architecture building culture discs elements iconic landmark metal modern New norway norwegian opera house oslo style wall blink decay gray grunge grungy old oxide plate plates rough scrap script sheet speckled steel textural urban decay weathered write writing panels silver