Braille graffiti

Lately, I've been amazed by the street art work of dwaesha, especially these "Braille Graffiti" (2005):

Why do I blog this? I already dealt with podotactility here, in this example, things are different (although it looks like vertical podotactiles). What is intriguing is the idea of touching graffitis... Remember something? Very curious practice indeed, but still.