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.