Darcheology is a tool for exploring and managing darcs repositories. It provides an intuitive interface to help you discover patterns and connections in your source and travel forward and backwards in history viewing files. I was hired to do the application icon as well as the toolbar icons. The application icon was definitely a hard concept to illustrate: quantum mechanics. I won't dare try to explain quantum mechanics to you, but I will say that the app icon is illustrating the different possible locations a certain particle can be within a given space at any given time. Whew. And, yes, that lock has a face - we call him Locky.