It is an analog clock displaying the system-time. It leverages the new visual features offered by Xorg 7.0 in combination with a compositing-manager (e.g. like xcompmgr or compiz), GTK+ 2.10.0, cairo 1.2.0, libglade 2.6.0 and librsvg 2.14.0 to produce a time display with pretty-pixels.