Wrights Writing Corner: The Logic of Character Revisited

A post about the phenomenon of 3-Dimensional characters.
http://www.ljagilamplighter.com/2010/11/10/wrights-writing-corner-the-logic-of-character-revisited/

The logic of character is the thing that makes it so that characters come alive, the thing that makes it so that quality A and quality B overlap to make Character C who not only seems vivid and 3-Dimensional but also begins to act on his own.
What do I mean by “act on his own”? Surely, characters do not write themselves without writers!