Has anyone realised that if symmetry is actually key to beauty, you could take either half of any face image and reflect it, and you would have a beautiful face? This is obviously not the case, and even the most beautiful face put through this procedure gives quite a different result for each side, hence asymmetry. Obviously, the perception of symmetry is an integral part of a beautiful face, but only if the proportions of the features to each other are correct. A beautiful face is close to symmetrical, but a symmetrical face is not necessariy beautiful. If you look on a popular search engine for "beauty mask" you will find reference to a mask for measuring beauty based on the golden ratio which is the basis for all natural beauty as found in trees, flowers, sea shells etc. This is a far more useful and accurate measuring stick than symmetry alone could ever possibly be. Sorry for the long winded response but this attempt to oversimplify the attributes of facial beauty by talking simply about symmetry really annoys me. It's like saying a dog has four legs, therefore if it has four legs, it must be a dog!??