Mona Lisa's smile a mystery no more
newscientist.com
newscientist.com
I suspect the people finding it "mysterious" are suffering from an aliasing error, basically, binning a complicated thing (the human face) into far too few bins.
You're not kidding! http://face.paulekman.com/default.aspx
Personally, I've never seen the Mona Lisa's smile as that complicated. Her mouth is smiling, her eyes are not. When you look at the bottom half of her face, you see a smile. When you look at the top half, you don't.
There are also lines in her cheeks that make it look like her mouth curving upwards, but the lips are actually quite flat.
Try looking directly at her eyes, then down at her mouth. Her expression seems to morph.
http://www.grand-illusions.com/opticalillusions/angry_and_ca...
So did Leonardo intend to sow so much confusion in the brains of viewers, not to mention scientists? Absolutely, Otero Martinez contends. "He wrote in one of his notebooks that he was trying to paint dynamic expressions because that's what he saw in the street."