Since the beginning of the universe, mankind has experienced more or less the power of colors, their relation to nature, their attribute and significance. Not only do colors characterize a society; they more importantly are at the essence of every thing. Color is a perception (from our eyes) that result from the complex characteristic of the light. Color is a significant element of our society but appears a complex notion to define because it is complicated to distinguish an object from its color and vice versa. The reason for which must be our poor knowledge in color terminology. Indeed, most of the early civilizations could not discern the lexical differences between an object and the color it was representing (This lexical issue drove some historians to wonder if certain civilizations were blind to specific colors). At the arising of the third millennium, both the perception and the definition of color seem an arduous task. Yet blue, as one of the primary color, illustrates from its history and its art representation how one color could be both so complex and meaningful. Blue is the color of fear for the painter Jacques Monory, the color of the coat of The Virgin Maria, the Levi-Strauss jean, the satellite images of earth. It is also the favorite color of European population. Blue embodies divers connotation in history.
             The history of the color Blue is very absorbing due to both its late beginning and its difficulty to master though it was very present in the nature (sky, sea, some flowers and animals). Some early civilizations did not have a name for the color blue but for an association of colors, which was including the color blue, that emphasizes the modest place blue took during the first centuries in most of the civilizations. For instance, numbers of philologers wonders if the Greek and the Romans could see the color blue because they did not have a word for it, they did not qualify the sea or the sky...