It's interactive in so far as different people can put up messages. The manifestation that I was helping to assemble is headed to an art festival in Toronto where it will be placed on sky-scrapers.
Being a part of the construction was fascinating. The artist has a large shop in a Phoenix industrial district and then he seems to command an army of volunteers/interns/friends/administrative assistants for several straight weeks to create the project. There are people in his shop 18 hours a day for what appears to be no money.