Here’s a notable fourfold of dualities: the Ogdoad, or eightfold of deities. I usually don’t stray into ancient mythology but this cosmological system evidently led the Greeks to their idea of the four elements. These paired male and female deities were personifications of certain metaphysical concepts and their opposites.

• Amun and Amaunet: The Hidden and its opposite
• Nun and Naunet: The Abyss and its opposite
• Kuk and Kauket: The Darkness and its opposite
• Huh and Hauthet: The Boundless and its opposite

Some even conjecture that the word ANKH was formed from the initial sounds of these four or eight deities.

Further Reading:

https://en.wikipedia.org/wiki/Ogdoad_(Egyptian)

http://www.sacred-texts.com/afr/stle/stle12.htm

https://henadology.wordpress.com/theology/netjeru/hermopolitan-ogdoad/

http://malankazlev.com/kheper/topics/Egypt/Hermopolis.html

http://www.doremishock.com/articles/thememphitetheology.htm

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