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Old 05-08-2016, 02:45 PM
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engineer_comp_geek is offline
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All joking aside, everyone has a certain amount of facial asymmetry. Wikipedia even has a nice drawing of a face that has been cut in half and each half duplicated and flipped to make the point.
While symmetrical faces (leftmost image) are perceived to be attractive, completely symmetric faces (a and b) are disconcerting and are not perceived as normal.
See the picture at the top of this article:

That said, Lincoln's face showed a greater degree of asymmetry than what is normal.

Laser scans of two life masks, made from plaster casts of Lincolnís face, reveal the 16th presidentís unusual degree of facial asymmetry, according to a new study.

The left side of Lincolnís face was much smaller than the right, an aberration called cranial facial microsomia. The defect joins a long list of ailments ó including smallpox, heart illness and depression ó that modern doctors have diagnosed in Lincoln.

Many of the potential implications of Lincoln's facial asymmetry along with his other distinctive features are discussed at length in this wikipedia article: