In Ritual Magick, the hexagon is called the Seal of Solomon, and represents Divine Union, being composed of a female, watery triangle, and a male, fiery triangle. The traditional elemental triangles of earth, air, water, and fire are derived from the seal. According to a very old legend, the seal was engraved upon a magic ring, which Solomon used to control demons, which he enslaved to build his famous temple. When the points of a hexagram are connected, a hexagon is formed. Kabbalistically, the hexagram represents the Sefirah Tifaret, perfection.
In this alchemical image, the Seal of Solomon is enclosed in a Ouroboros pair, two snakes or dragons biting each others’ tails. The ouroboros is commonly shown in a single form as used in the emblem of the Theosophical Society.
August Kekulé, the chemist who first realised the structure of benzene, described how this inspiration came to him in a dream:
But look! What was that? One of the snakes had seized hold of its own tail, and the form whirled mockingly before my eyes. As if by a flash of lightning I awoke; and this time also I spent the rest of the night in working out the consequences of the hypothesis.
This six-fold structure inside a ouroboros was used as inspiration for a science-themed postcard.