feedback               
                                      
                            
                            
                                          
 feedback  is  for making  the process  a 
 whole lot more  messy,  to  introduce  a 
 fractal  in the  spice mix... things  or 
 populations of things  start to be  self 
        referential or self eating        
 (autovore...) or spiraling in or  out... 
                                          
 in the sixties they did  research in the 
 jungle and  in  the sea and  they  found 
 that feedback  does  not give rise to an 
 equilibrium.  they were  trying to prove 
 that nature is a  tame  beast. but she's 
                   not!                   
 this  may  hold  true out  there...  but 
 maybe not in signal  wizardry? depending 
 on  your  technique,  you  might  easily 
             find recurrences.