A 46 foot long chalkboard and two live painters are part of this huge billboard. The painters began to reveal an elaborate equation, there was only a banner that teased, “Solutionism. The new optimism.” Throughout the execution people were invited to participate and guess portions of the equation through the website (giantchalkboard.com) and the twitter handle (@giantchalkboard). After five days, the answer was revealed to be 7 billion, which represents the soon-to-be world population.