Her book project Fietsen is a collection of photographs of bike commuters in Amsterdam. For five days in September of 2005, she spent one hour a day photographing cyclists as they rode past her second-story apartment window. She ended up photographing over 1600 cyclists, 118 of which were selected for her book. Take a look at the sample slideshow; it’s clever how she paired up the photos based upon characteristics such as color, contrast, activity, etc.