Edward Willett, A person's face can say a lot: Helen's face is said to have launched a thousand ships, while Medusa's could turn men to stone. And even today we talk about individuals with "a face that can stop a clock.", The Leader-Post (Regina), 29 ottobre 2008. URL consultato il 15 luglio 2011 (archiviato dall'url originale il 10 novembre 2012).
«[...] "people preferentially mate with, date, associate with, employ, and even vote for physically attractive individuals." [...] Symmetry is one trait we find attractive (but only if the face is right-side up: your symmetric face will, alas, do nothing to help you attract a mate if you constantly stand on your head.»