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.