Pareidolia is a work by Driessens & Verstappen.
In the artwork Pareidolia* facial detection is applied to grains of sand from the island of Texel. A fully automated robot search engine examines grains of sand in situ. When the machine finds a face in one of the grains, the portrait is photographed and displayed on a large screen.
* Pareidolia is an illusion in which the observer perceives something recognisable in something it is not.