Merkaba

The Merkaba is composed of two tetrahedra which are pushed into each other and which can be derived from the shape of the cube. The two tetrahedra represent the innermost law of the recognizable world: the inseparable connection between the two complementary halves - the positive and the negative - which lie in each other, form a perfect equilibrium and sit as creative spirits to the right and left of the deity. In creation they operate as two opposing laws: the law of the spirit and the law of matter. Spirit is life, matter is resistance. The law of the spirit is radiance, giving, selflessness. The law of matter is contraction, cooling, numbness.
There is only one living being that consciously embodies both laws: man. It forms the link between the spiritual and the material world.