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	No need to understand how "helpers" made, just understand what they do.

	
Usefulness of prototype tree

    Check these propositions:

    Object.prototype is a root of prototype tree.

    Prototype tree is a "dual" or "ghost" tree attached to all objects.
    Visually it has a very interesting view.
    Let's recall an Exercise 2.

	

	//	Exercise 2: 

	          var x = { xx : 'XX' };
	          var y = Object.create( x );
	          y.yy = 'YY';
	          x = Object.create( y );

    //  x ... y ... o --- xx --- XX
    //                ... Object
    //          --- 'YY'
    //Here we denote "visible" edges of tree with "---" and "invisible" as "...".
    //We denoted "overriden" version of `x` as `o` because this object no longer has name in JS.