27th April 2009 - -
Throughout much of the advertising that you see out there, as well as in many presentations, the use of silhouttes can be a very powerful (yet simple) visual device. It allows for quick reference to the subject matter using plain colours and lets the audience focus on the core message/ accompanying text.
This is just a quick example of it being used on a title slide and a quick diagram.
Here is an actual presentation from the economist will many good examples of the use of silhouettes.