The real meaning of the messages written on the walls is not usually understood by the intellect. This is especially true when the code of these messages is not consciously known by their authors. Their feelings of being disenfranchised, their frustrations, racial prejudices, cultural identities, and emotions are tagged upon these walls without the logic or reasoning of what we are accustomed to viewing as art. They have a primordial connection with our distant ancestors and their petroglyphs, hieroglyphics, and cave drawings.
Their meaning is made even more ambiguous with layer upon layer of messages and drawings. They then become a collaboration of the author, time, erosion and transparency until the effect is like some huge abstract expressionist painting. The meanings are then left to our own emotional response. We take in the whole, examine the details and feel a message that transcends time, preconceptions and art.