Who am I? is a digital installation in the science museum.

Who am I? invites you to explore the science of who you are through intriguing objects, provocative artworks and hands-on exhibits.
one installation in particular uses camera to pick up on the movement of the participants and projects that back on to the wall they are facing in smaller particles.

Hers an example video:

Who Am I? interactive screen at London’s Science Museum from Camille Fontaine on Vimeo.

http://www.sciencemuseum.org.uk/WhoAmI/Visit.aspx