The series was created using natural density filters that enable extra long exposures and limit light entry without closing the aperture or increasing the shutter speed. This allows them to remove moving objects such as people and cars.
The picture are taken at many locations including Times Square in New York, Tiananmen Square in Beijing, and Place de l'Opera in Paris.
The curator of the series, Klaus Honnef states that the inclusion of the small intrusions give the series its impact as 'their disconcerting presence disrupts the majestic calm of the streets and squares. Are the latter guilty of victims?'
http://vimeo.com/lucieandsimon/silentworld
http://vimeo.com/lucieandsimon/silentworld
Via Designboom