In Mystic Astrology the building block of understanding the mechanics of elemental energy flow is by comprehending the links between houses that harmonize with each other. The houses in the astrological natal chart represent dimensional fields of experience that a soul embarks on upon incarnation. All the houses contain a zodiac sign (movement of light) tenanting them and some houses contain planets which serve as agents for the signs.
The houses are grouped by elemental resonances into triangles - 4 groups of 3. This in itself is a divine geometric pattern. 3x 4 = 12 that is geometric key to wholeness. The number 12 is the divine number for wholeness and completion. This is the reason why this number signifies the 12 hands of time amongst many other key energies. By grouping energies into the 12 ratio either by 4 groups of 3 (elements) or 3 groups of 4 (modalities) will provide you with key insights into the energy of wholeness.
The 12 houses can be broken down into 4 groups of 3 by focusing on the elemental energy 'governing' that house. All aspects or facets of life are covered by understanding your blue print from this perspective. The interpretation of your birth chart should always begin with an analysis of the elemental houses. See the trinity pages for details.