Geometria Arcana, part 1 is a manual in The Blood of Dawnwalker.
As Plato tells us, the world around us is but a distorted reflection of another, subtler realm – the realm of pure ideas. Though we may glimpse it in dreams or mystic visions, we cannot describe it, for our language is too imperfect a tool. Geometry, however, escapes the limitations of words. Shapes are form distilled to its purest and simplest – and therein dwells unfathomable power. As they say, though, the devil is in the details. The shapes need to be combined just so, and with perfect precision, too.
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Source
Transcribed from DawnwalkerDB.