Movies related to the article 

Dynamics and energy landscape in a tetrahedral network glass-former: direct comparison with models of fragile liquids
D Coslovich and G Pastore 2009 J. Phys.: Condens. Matter 21 285107 (13pp)   doi: 10.1088/0953-8984/21/28/285107

movie1.mpg : (1.4 MB MPEG) Four small particles (indicated by arrows in left panel of figure 13) perform a correlated, rotational motion in neighbouring tetrahedra.


movie2.mpg :  (1.7 MB MPEG) The central particle (indicated by an arrow in the right panel of figire 13) explores its low density environment with a sequence of two jumps, associated with bond breaking and reformation.