For millennia humans have sought out surfaces on which to communicate through illustration.
This of course can be outright vandalism…

Graffiti mesh
Some have become notorious (albeit unknown?) for getting a political message across. Such that their work has become regarded by many as art…!

Bethlehem, Palestinian Territories – January, 25 2011: Banksy grafitti on a wall in the occupied territories
Providing for this urge to communicate via illustration in the workplace is an essential factor in creating an agile environment.