I was always of the mind frame that a person could trace the bases as such:


        ___           
      /`-_)_)             
     (   ='6-,        
    _)  ) ,_=   -- first base      
   (,   /\ \         
  (,   | |--) ---- second base   
   (,  |: ;/     
    `-'\| (     
      /(/--; ----- third base/home run      
     |~--~|        
     |~--~|         
    /~--~~|          
   (_~~_~~_)      
Now I think we can use our imagination as to the difference between third base and home.