Almost anyone is familiar with the symbol of Yin Yang, a popular image on T-shirts:
This primordial two are regarded as having derived from a primordial no-thing, a no-thing with infinite potentiality. This has many names, and is most commonly called the Supreme Ultimate. From this comes two and from the two come four.
The four can be found as the bigrams of the 'I Ching' or 'Book of Changes', as the Tetragrammaton of Kabbalistic mysticism, as the four elements of traditional philosophy, the four suits of an ordinary deck of playing cards, and even as Scientology's "Four Conditions of Existence" (which correspond with the Kabbalistic Tetrgrammaton - the four primary ingredients of existence).
And there are other possible correspondences: http://hyperphysics.phy-astr.gsu.edu...es/funfor.html including the Tarot, which, like the 'I Ching', is best known as a means of fortune telling, but could also be regarded as a kind of philosophical machine: http://www.tarot.com/about-tarot/lib...ys/minorarcana
And last but not least, Richard Wilhelm's translation of the 'I Ching', which addresses the eight Trigrams, and the sixty four Hexagrams: