It involves zero people, and a hundred soccer balls.
Via: reddit.com
The impressive installation was set-up today, June 22nd, on Copacabana Beach by the NGO Rio de Paz. From their website:
"We are a group of citizens from all segments of society interested in the defense of human rights in our country. We have no political connections or connection with a public institution and our biggest concern is public safety."
Brazil is currently prepping to host the 2014 World Cup next summer.
Here's a video report on the installation.