A study of the tags on the retaining wall pictured above suggest that this may be the work of the street toughs enrolled at the nearby Rocky Mountain School of Expeditionary Learning. The hand-painted reminders of "Hope!!" and "you would do better" are lessons lifted straight from the mean hallways of a collaborative learning environment. The north retaining wall, awash in practice portraits and graffiti homework, can be seen below:
The photograph above aptly demonstrates how bad graffiti looks better when there is more of it! And that's just one of lessons learned by the students who have been ditched by the public schools.