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The StarTetrahedron is one of the most important Sacred Geometrical forms. The tetrahedron is the simplest of the 5 Platonic Solids, but it is not fully symmetrical. However when two of them are interpenetrating like this then they are fully balanced, and their outer vertexes form a cube whilst their inner vertexes form an octahedron.
Thus In one form the StarTetrahedron contains the 3 core shapes that exist in all dimensions, the 'Simplex', the 'Cross' and the "Measure'. Understanding how this triad of forms continues through the dimensions can open a window to perceiving higher dimensional geometries.
The StarTetrahedron was popularized by Drunvalo Melchizedek as the 'Merkabah' or 'Light Body' vehicle for the Soul in his very influential Flower of Life courses and books.
Here we have nested them to imply the spin and pulsation as they move between octaves of frequency and relative to their size.