The Holy Palace
The Sefer Yetzirah (Book of Creation) teaches the mysteries of the Twenty-two Hebrew letters. The alphabet is presented there as three groups of letters. One group is called the Three Mothers. The second group is called the Seven Doubles. The third group is called the Twelve Elementals.
All of the Hebrew letters are related to different aspects of Time, Space and Spirit (the human mind/body). For example, the Three Mother Letters (Mem, Shin and Aleph) in Time are the three seasons (cold, hot and temperate). The Seven Doubles in Time are the seven days of the week. The Twelve Elementals in Time are the twelve months of the year. This picture shows how these numbers are also prominent in simple color theory and simple geometry.
From Sefer Yetzirah:
"Seven - three opposite three, and one is the rule deciding between them."
In terms of colors, ‘three’ are the three primary colors - blue, red and yellow. The ‘opposite three’ are their complements - orange, green and purple. Look at the six-pointed Star of David here. See how one triangle (pointing down) is made with the primary colors and another triangle (pointing up) is made with the complementary colors - ‘three opposite three’. These six colors are also six rings that are linked around the six points of this star - each colored ring opposite its complement. A large white circle runs through these rings. This represents how white light is formed by all the colors of the rainbow.
In the center of the star is a brown ring. This is the seventh - ‘the one that decides between them’.
From Sefer Yetzirah:
"Seven Doubles in Space are
Up and Down, East and West, North and South
and the Holy Palace precisely in the center and it carries them all."
Notice how you can see this image as a three-dimensional space. I got this motif from the artist M. C. Escher. You can see the center point as either going in or coming out - or both. If you focus your eyes on the center point, relax them and breathe, a transparent cube can be seen. A cube has twelve edges. Thus a three-dimensional space - a cube - has six faces plus the center (the Holy Palace) and twelve edges.
The Holy Palace in colors is brown because if you take any color (of paint not light) and mix it with its complement you get brown. Earth-tones can be made by blending yellow and purple; blue and orange; or red and green. Brown (representing the fourth element Earth) is the Holy Palace precisely in the center and carrying them all.