Use of Silhouettes in Concept Design

Found an interesting blog called "Academy of Art Character and Creature Design Notes". Link: http://characterdesignnotes.blogspot.com

While searching for tips for creating good character designs, I stumbled upon this blog, and saw something about silhouette thumbnails. Link: http://characterdesignnotes.blogspot.com/2011/03/use-of-silhouettes-in-concept-design.html  This method is useful to design characters in large quantity and in a short period of time. The interesting part about it is to  make each character design's silhouette different so that people can easily recognize and differentiate who is what, or what is who. Through the character's silhouette, one can also identify the gender, personality, type or style of the character. Although useful and interesting, not every concept/character designer applies this method.

Example of method:

Picture 1: Silhouettes of Character Design by Ben Mauro. Link: http://www.artofben.com/