Consider these two silhouettes:
The one on the left looks a little like one of Abe Lincoln. And the one on the right looks more like Bart Simpson! Doesn't it!
So where did these come from?
They are both inversions and enlargements (same scale) of the areas framed by the bottom part of the letters 'R' supposedly produced by the same typewriter. What a joke! The first, the Lincoln one, comes from the 'R' in Barack Obama's given name on the "birth certificate" he released on April 27, 2011. The other one, the one that looks like Bart Simpson, comes from his father's name on the same document.
ML/NJ
There are similar variations found on the letters pulled from the comparison birth certificate in this article.