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.