Maybe Phoenix could use QC Codes to highlight special places especially along LRT.

Rio DE Janiero is imbedding them in sidewalks in preparation for the Olympics The visitor uses an app to receive directions and information about the place..We could do this on station floors, outside stations on the sidewalk or a building wall.to assist our visitors.

In my opinion, Embedded QC codes are more sophisticated than signs, not to mention more astheticly appealing.