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.