It's not just a crack on the wall. "Find the cracks and exploit the discoveries to be revealed there . then move on to practice running headlong into the brick walls. Cracks crack first. Heads crack before brick walls. (from: STREET ART UTOPIA)"
"Here in Iran," a masked street artist explains, "if they arrest you when you've finished painting on the wall, they'll consider you are supporting Western culture or Satanism! What we do is totally different. Our themes include children's rights, peace, friendship. It's not what the government thinks."