A number of studies have found that facial symmetry plays a role in perceived standards of beauty in both men and women. Generally, the more symmetrical one's facial features are, the more attractive they are considered to be by others.
Experimenting along the lines of that theme, photographer Alex John Beck creates perfectly symmetrical facial portraits by digitally dividing faces in half, matching the the left halves together and repeating the same method with the right halves. The actual portrait is not shown. 
The resulting photo series, which Beck calls "Both Sides Of," creates two portraits that are amazingly different when observed side by side. In some instances it almost doesn't look like the same person. Beck comments via his website:
“The less symmetrical they are initially, the more different the characters suggested by each face. The more symmetrical faces betray their owners more subtly, however, one side proves clearer, the other more inward looking.”
Via Beautiful Decay
  
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but.. dont, *please* DONT feed your cat tuna!!
it has a lot of added salt, witch we humans like and can digest..
but it WILL destroy our lovely pet's kidneys in the long run...
fact; salt + cat = slow horrible DEATH
Pass...
a more purrr-fect pet U won't find
what kind of engineers are they? Not using the metric system *scoff*.....lol
great video!!!
I too have cats and can relate-although not groovin on the spinning of the cats- not good for them at all, and the tuna thing although they love it, not good for them either. Other than that....A+!
and on the other side, i could easily say that cat owners who smoke are slowly killing their felines, too. and owners who let their cats outside because they have that much more of a chance to get hit by a car or run away. and the food that they eat has antibiotic residues and such as allowed by the FDA. so really, we're all slowly killing our pets anyway.