We all used stensils in school. Those funny letters that you paint in and they showed through to the next page. In the 60s I think a lot of people used them to manufacture posters. You couldn’t get too elaborate but they worked for political events. But now street artists are using them and they are very effective. This particular group Icy and Sot did this one in Iran amongst the ruble. I think this must have taken some courage to do. You never know how the state is going to react.