It is a projection of 12 meters high x 4 meters wide on each phone call made in the Zócalo is represented by
a digitally animated small piece of paper that flies.
The Zocalo is represented by an imaginary line from which a small animated paper emerges every time someone make a phone call from the Zocalo area.
Conversely, small papers fall down toward the imaginary line every time someone gets a phone call in the Zocalo.
