"As an installation, Passages is situated in two different locations connected with each other via a network. A vertical translucent interaction surface, made of glass and textile and recalling a shop window, is set in each location. As a random passer-by walks in front of this surface, the contour of his/her silhouette is reflected in a visual style that evokes drawing or sketching. "
Reference:
Joëlle Bitton, Distance and Sexuality: where HCI meets convenience and affinity, position paper for the workshop "Sexual Interactions: Why We Should Talk About Sex in HCI", CHI 2006 Conference on Human Factors in Computing Systems, Montréal, 22 - 27 April 2006.
http://web.media.mit.edu/~stefan/hc/projects/passages/