Many thousands of years ago, in ancient Greece, Helen of Troy, responsible largely for the historic Trojan War, was considered a paragon of beauty, exuding a physical beauty and human appearance that was unparalleled by any other.
This beauty from Athens was so highly regarded for her human appearance that all others looked pale before her physical perfection, a grace of face and limb that was almost intoxicating for those that chanced to see her and a topic of great debate for scholars and philosophers alike as to what really contributed to this equation of beauty and human appearance and how everyone else reacted to it.
Greek philosopher, Plato theorized in this context of beauty and human appearance that a face that combined the Golden proportions- including width of an ideal face (two-thirds its length), nose no longer than the distance between the eyes etc. would be the criteria for judging beauty. However, these golden proportions of Plato's are not entirely acceptable in today’s changing concepts of beauty and human appearance as determined by studies of modern psychology and biological research; though, most modern day scholars grant Plato their affirmation with his theory of perhaps a basic symmetry in human face being necessary for defining human beauty as observed in human appearance.
Symmetry is attractive to the human eye and this is a scientifically proven fact that it is an important constituent that people use to outwardly judge a face that is considered to be inherently attractive to the human eye. Beauty in the modern world is now less defined with proportions, as was the case in earlier times, and is now greatly determined by the similarity between the left and right sides of the face. Thus, the Greek standards of beauty as observed by human appearance have changed over the centuries with only the fundamentals of symmetry still applicable in small measures.
Modern day researchers now believe symmetry along with an innate and emotional perception of life's affirmative and meaningful aspects is what constitutes beauty between objects when human appearance is studied. When things are believed to being in harmony with nature, it brings out a feeling and experience of attraction, affection and pleasure that is apparent in human appearance, which in turn looks beautiful.
Thus, when we speak of any object of beauty, in the modern context, this may mean anything that is filled with a personal meaning or that which may have been assimilated in the subconscious due to sheer commercialism having promoted certain concepts and ideologies about beauty having certain parameters. These differ culturally all over the world and each culture has it own variations of the take of what constitutes beauty for them. In the U.S., studies reveal that facial symmetry may be important since it validates the health of a person, free of visible genetic defects, while other cultures may define beauty by parameters like the traditional, subtle features of a waist-to-hip ratio of about 70 percent.
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