The project presented here is a kind of revision of the traditional surveillance system. There are no people or vehicles on these long exposure photos, only empty squares that are actually well-known places of Budapest. These photos, shot over months, are prints of consolidated space and not images of everyday life.
The artist observed the eventful squares, intersections of Budapest with pinhole cameras, several ones per square, made of beer cans. He fixed the cans on electric pylons, traffic lights or in similar heights so that they could well cover the given square. He placed black and white photo paper in the cameras on which he exposed over months.
source: http://www.artcapital.hu/extra-muros-art-capital-basel/