3. Trinity
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"Continuing our geometric journey from Oneness to ‘The Many’, we turn our attention to the first shape born through the  doorway of the vesica piscis: the triangle; an expression of three-ness (Ancient Greek: The Triad).
Born of the interaction of two circles (the two geometric parents), Three can be regarded as the first child/number/shape to emerge through the polarised limits of duality."
This chapter explores threeness, triangles, triskele, triple spirals and trinity knots. Including where we find them in nature, architecture and sacred art. 
Geometry drawing guides for triangle and triskele