FREEMASONRY:
Freemasonry is a worldwide fraternal organization. Members are joined together by shared ideals of both a moral and metaphysical nature, and, in most of its branches, by a constitutional declaration of belief in a Supreme Being.
Freemasonry is an esoteric society, in that certain aspects of its internal work are not generally disclosed to the public, but it is not an occult system, and in recent years, it has become less and less a "secret society" than a "society with secrets". Among the reasons given for the amount of secrecy that remains, is that Freemasonry uses an initiatory system of degrees to progressively explore ethical and philosophical issues, and that the system is less effective if the observer knows beforehand what will happen. It is often referred to as "a beautiful system of morality veiled in allegory and illustrated by symbols."
Freemasonry upholds the principles of "Brotherly Love, Relief and Truth"
BLUE LODGE:
A Lodge, often termed "Blue Lodge" in Constitutions, is the basic organization of Freemasonry. It refers to a Masonic lodge that is capable of conferring the three degrees of Masonry upon its members. Those degrees, which are referred to as blue degrees. But what is the significance of the color blue? Blue is emphatically the color of Masonry. It is the appropriate tincture of the Ancient Craft degrees. It is to the Mason a symbol of universal friendship and benevolence, because, as it is the color of the vault of heaven, which embraces and covers the whole globe, we are thus reminded that in the breast of every brother these virtues should be equally as extensive. To the Jews, it was the color of the robe of the high priest's ephod, breastplate and the plate of the miter. It was the color of the ribbon people were directed to wear above the fringe of their clothing, and it was the color one of the veils of the tabernacle where it represented air. Further, the Hebrew word for the color blue is "tekelet", whose root signifies perfection.
Among ancient Druids, blue was a symbol of truth, and the candidate, in the initiation into the sacred rites of Druidism was invested with a robe composed of the three colors: blue, white, and green. Egyptians esteemed blue as a sacred color. "Amun", the principle god of their theogony, was painted light blue to imitate his "peculiarly exalted and heavenly nature."
Among medieval Christians, blue was sometimes considered an emblem of immortality. Blue was the symbol of hope, perfection, and constancy. The azure color of the sky was in divine language the symbol of eternal truth: in consecrated language, or immortality.
*Information taken from "Encyclopedia of Freemasonry" by Albert Mackay, 1912 Edition.