Arcs 21 is the latest application for the iPhone by the Austrian generative artist Lia. Originally created in Processing, which you can view here, Arcs 21 has been ported to the iPhone using openFrameworks. The app includes controllable parameters allowing you to influence the sculpting the development of the artwork on your screen. No single images is the same as any other.
See this flickr group for images created using the Processing app.
From December 2009 until April 2010 the original Arcs 21 can be viewed in the Victoria and Albert Museum as a part of “Decode” exhibition.