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Gallery of universal triangles.
Hexagram i-jing 20.

1. Perfect world.
ARIES - cardinal sign and first quarter of zodiac.
LEO - firm sign and second quarter of zodiac.
VIRGO - mutable sign and second quarter of zodiac.

2. Person.
CAPRICORN - cardinal mark and elements of ground.
AQUARIUS - firm mark and elements of air.
GEMINI - mutable mark and elements of air

3. Imperfect world - unconscious sphere.
TAURUS - initial third of astrological circle and symbol of earth element.
LIBRA - middle third of zodiacal circle and symbol of air element.
AQUARIUS - last third of astrological circle and symbol of air element.

4. Imperfect world - conscious sphere.
CAPRICORN - third segment of zodiacal chart and ground natural elements.
LIBRA - second segment of zodiacal chart and air natural elements.
GEMINI - first segment of zodiacal chart and air natural elements.

5. Discrete world - astral sphere.
CAPRICORN - area of slow planets - earth elemental nature.
LIBRA - area of less rapid planets - air elemental nature.
GEMINI - area of fast heavenly bodies - air elemental nature.

6. Discrete world - ethereal sphere.
VIRGO - slow heavenly bodies and ground elementals.
AQUARIUS - less rapid heavenly bodies and air elementals.
GEMINI - fast planets and air elementals.

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In some cases various hexagrams i-jing form identical triangles in space of astrological charts of different levels of world reality, that can be interesting to researchers of the Chinese Book of Changes or for astrologers.
For example, 64th and 42nd hexagrams in space of astrological charts of perfect world and human person form two identical triangles with angular aspects of 120x120x120 degrees, or otherwise to tell identical triangular figures which correspond with zodiacal signs Aries, Leo, Sagittarius.

Next 21 hexagram.
Information about triangles of zodiacal signs and serial numbers of hexagrams.