Metisse is not focused on a particular kind of interaction (e.g. 3D) and should not be seen as a new desktop proposal. It is rather a tool for creating new types of desktop environments.
Metisse was used, for example, to implement the User Interface Façades system, a system that allows to adapt, reconfigure, and re-combine existing graphical interfaces through direct manipulation techniques. It was used by Mekensleep to integrate GTK+ interfaces into the OpenGL-based Pok3D game. It is also being integrated into Mandriva Linux Spring 2007, the forthcoming version of Mandriva Linux.