These are the iterations of the previously discussed grasshopper definition.  The system on the left has its ratios(see first article) set to change at each iteration starting at .3 moving towards .8 and then returning to .3 at even intervals.  The system on the right is used as a control it is permanently set to .5.  All of these itterations stem from an understanding of flocking, researched from Craig Reynold’s original algorithm.  For a better understanding I would recommend that people start there, Craig has very simple rules that explain the processes that are occurring.