This video shows an experimental 3D user interface using touchless gestural interaction in combination with physics simulation. The snowflakes will adjust size and perspective to the position of the viewer in the room. The snowflake can be rotated with single hand movements. New snowflakes can be generated using a two hand gesture.

The installation is mobile and can be put up everywhere in almost no time. The technological base is at the moment a 3D camera from MESA imaging, but it would work the same way with a Kinect controller (which I'm evaluating). The interface is a simple Unity3D program with a single 3D model which is animated using the integrated physics engine.

Additional credits: Snowflake model from pradodesign via Google 3D gallery, Music by MP via Soundtaxi.net