There is something primitive and almost compulsive about leaving one's mark on walls. They did it in caves before there was writing. Ron's shown us aboriginal wall art. Here is the version one sees in the cities of the American northeast.
...is to fill 52 themes, one a week for the year. Some weeks, maybe I'll try to find several photos to fit the themes. Others, I may spend more time trying to perfect one that seems best to represent the theme. Three years of a photo-a-day opened my eyes, now I want to hone my skills.