PBS Off Book Series : The Art of Logo Design

Official Description :
Logos are a part of our everyday visual landscape, but few of us take the time to examine the thought and design that went into these symbols. Utilizing a silent vocabulary of colors, shapes, and typography, logo designers give a visual identity to companies, communicating personality and values to the consumer. From cave painting and mosaics, to modern agencies and freelance graphic designers, artists through the years have been rendering the complex down to the simple to communicate ideas to the world. 

Interesting episode from PBS OFF Book on The Art of Logo Design.