blind book braille finger letter page paper pattern read Scripture sightless texture touch word alphabet closeup communication dot hand learn lesson literature text black side wave white aluminium architecture building concave concavities convex culture discs elements iconic landmark metal modern New norway norwegian opera house oslo panel silver style surface wall background bumps city crosswalk feel San Francisco sidewalk street tactile urban warn warning yellow blink decay gray grunge grungy old oxide patterns plate plates rough scrap script sheet speckled steel textural textured textures urban decay weathered write writing panels