These podotactiles, found on the subway platform in Lyon, France (metro station "Jean Jaurès" direction Charpennes) look quite funny, as if they had been stuck and removed:

As the color shows, they have been removed over time (one can see the mark of previous podotactiles) but what if this could mean something in Braille ;) One step towards more use of proprioception as a sense to navigate the city (an often overlooked one for sure, not by skateboader though)!