Stackplot showing loop dynamics as a function of time in a cut through an evolving post-flare loop system (the cusp is toward the top of the plot). The overall growth of the loop system is visible as the left-to-right upward trend in the bright emission, but superposed on this are a number of downward-propagating, less intense features, indicated by boxes, which correspond to shrinking loops. [Reproduced from Reeves, Seaton, and Forbes (2008) by permission of the AAS.] (Color online)