Just Craziness.
Kaya is ravishing. She has full lips, long lashes, and a slightly upturned nose. Her expression radiates confidence and power, and her smooth skin is well scrubbed and dotted with freckles. But she doesn't have much of a body. At all. In fact, she exists only from the neck up. Kaya is a CG model, a 48,200-polygon beauty created by an artist in São Paulo, Brazil. And she's sure to be a finalist in the Miss Digital World beauty pageant.
http://www.wired.com/wired/archive/12.11/virtual.html