In February 2011 the American urban planner Candy Chang turned the wall of an abandoned house in New Orleans into an enormous blackboard. She stenciled the words "Before I die, I want to..." at the top of the wall and provided the chalk passers-by needed to complete the sentence. Was the installation ignored, vandalized or ridiculed? No. People filled it in no time with hundreds of serious inscriptions - hopes, dreams, reflections. Word spread, and the wall became a tourist attraction. By now there are hundreds of similar installations in many cities. Obviously that "Before I die..." is a sentence many of us long to complete.