On nine windows of the Marunouchi Building observatory, we placed black stains to represent the hole in the ozone layer. The stains lying against the real sky created an eerie effect, serving to hammer home the environmental message. The stains we created were accurate renditions of NASA satellite imagery.

During the campaign period approximately 750,000 people came in contact with the advertising. To convince the building owner to accept this unprecedented campaign, we argued, correctly, that the campaign would bring more visitors to the building. As a result, there was no cost for the use of the media.