The document discusses Autography, a playful persuasive mobile application that allows people to draw digital graffiti at locations in Florence, Italy. It aims to influence behavior and encourage participation in a positive way. There was initially an idea for an app to remove real graffiti, but the creators realized graffiti can be a form of positive expression. So they developed Autography to make creating graffiti easier digitally. It has been successful, with about 100 drawings made per day. The document then discusses principles of applied games and the process for creating them to address complex topics.