"It is for the Adepts to understand the meaning of the symbols.
Return now, with us, to the Degrees of the Blue Masonry, and for your last lesson, receive the explanation of one of their Symbols.
You see upon the altar of those Degrees the SQUARE and the COMPASS, and you remember how they lay upon the altar in each Degree.
The SQUARE is an instrument adapted for plane surfaces only, and therefore appropriate to Geometry, or measurement of the Earth, which appears to be, and was by the Ancients supposed to be, a plane.
The COMPASS is an instrument that has relation to spheres and spherical surfaces, and is adapted to spherical trigonometry, or that branch of mathematics which deals with the Heavens and the orbits of the planetary bodies.
The SQUARE, therefore, is a natural and appropriate Symbol of this Earth and the things that belong to it, are of it, or concern it. The Compass is an equally natural and appropriate Symbol of the Heavens, and of all celestial things and celestial natures."
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If I understand correctly the blue lodges are the first few levels, I'd expect something so grand in scale to be a higher level secret.
True, the blue lodge is the first three degrees. Blue lodge is a "primer" for the cult. It's where the mind control programming of the cult's members begins. As is common within the masonic craft, the truth is thinly veiled in allegory.
1st degree / Entered Apprentice - The candidate is given his first opportunity to prove himself by his ability to fulfill a solemn obligation and to keep secret those things entrusted to him as such, while certain moral lessons are taught to him.
2nd degree / Fellow Craft - Places the candidate under an additional solemn obligation concerned primarily with his duties to his Brethren and the Craft.
3rd degree / Master Mason - Places the candidate under a much more solemn and weighty obligation, which concerns his behaviors and duties towards his Brethren, and also to widows and orphans.
According to Coil’s Masonic Encyclopedia, there may be a number of reasons why symbolic lodges are called Blue Lodges. Since ancient times, the color blue has been associated with immortality, eternity, and fidelity. References to the color blue in the Bible emphasize the special place blue has as a color symbolizing goodness and immortality. The Druids also honored the color while the ancient Egyptians used the color to represent Amun, one of their most important gods. The ancient Babylonians associated the color blue with the gods. In Medieval times, Christians saw blue as the symbol of perfection and hope, and well as of immortality and fidelity.
It is not known when blue first came to be associated with Freemasonry, although some historians think that initially the color was used in Craft Masonry to represent the sky. Today, blue for Masons symbolizes brotherhood and symbolizes the fact that Masons should seek out virtues as extensive as the
blue dome of heaven.