Sample of a "full" balanced binary tree showing order of nodes

                               16
                           /        \
                         /            \ 
                       /                \
                     /                    \
                   /                        \
               08                              24
            /      \                        /      \
           /        \                      /        \
          /          \                    /          \
       04              12              20              28
      /  \            /  \            /  \            /  \
     /    \          /    \          /    \          /    \
   02      06      10      14      18      22      26      30
  /  \    /  \    /  \    /  \    /  \    /  \    /  \    /  \
 01  03  05  07  09  11  13  15  17  19  21  23  25  27  29  31 

 Note: that the "value" of each node increases from left to right
       across the page due to the way the tree is drawn.


Sample of an unbalanced binary tree showing order of nodes

                               05
                           /     
                         /       
                       /         
                     /           
                   /             
               04                
            /   
           /    
          /     
       03
      /  
     /   
   02    
  /  
 01  

 Note: unused branches have a LEFT or RIGHT pointer that is null


Sample of an unbalanced binary tree showing order of nodes

                               01
                                    \
                                      \ 
                                        \
                                          \
                                            \
                                               02
                                                   \
                                                    \
                                                     \
                                                       03
                                                         \
                                                          \
                                                           04
                                                             \
                                                             05