The science of average faces
One can descrice a face with a number of parameters, which means that you can take the average of a large number of faces to end up with the average face, here one for women and one for men:
The average face happens to coincide with what many think is attractive and beautiful.
For each pair of faces there corresponds a transformation transforming one to the other. This transform can then be applied to another face (for example the transform can be "make face smile" etc) as in the example below from http://faceresearch.org