[of Boleskine] This instruction demonstrates that East is a concept, not a direction. In London, for example, "east" would be almost directly north.
[dimensions] These dimensions may be a veiled reference to the "Principles" mentioned in the seventh of eleven Collects: "Mysterious matter triform, mysterious matter in fourfold and sevenfold division...": 3, 4, 7; with 4 x 11 = 44. We have also seen it stated that these are the dimensions of the sarcophagus in the King's Chamber of the Great Pyramid at Giza. Also note that 44 = דם, blood.
[each side] These mimic Boaz and Jachin, the pillars of Solomon's temple. Together with the Stélé, they indicate the Supernal triad: Binah, Chokmah, Kether, above the Veil of the Abyss.
[great veil] This represents the Abyss. When Mass begins, it is open; the Priest will close it later.
[tomb] This description shows that the temple is laid out as though it were the Tree of Life. Stélé, square altar, font, and tomb form the middle pillar.
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