According to Art historian Sir Ernst Gombrich (1909-2001) to recognise an image, which ever it might be, there's a complex process requiring many human abilities, be them natural or learnt. This process is made of many stages, all of which take part in the "perception cycle". The first of those stages is the moment of attention or alert: a magnetic attraction as result of the strong colors, simple shapes or marked contrasts, but also a promise of a meaning for them all. That feeling of "watch it, this all means something else" is fundamental for an image to work and, in Gombrich's explanation, it comes from sensing the eyes in a face. They are what calls our attention at first and then guide our sight. Eyes, eyes, eyes...