It uses the memorized position of the windows that keeps before to be minimized to the dock and the possibility to place them somewhere in this case outside of the desktop area. The background of the folders uses a gradient design that plays with the overlapped horizontal animation creating a hypnotic and abstract visual effect.
Returning Folders is part of Macintosh Lab (2009-2015) series, exploring the idea of the computer desktop as current workplace > emilio.jp/macintoshlab/