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.