Sometimes called Law of Proportion

"One added to two to make one is equivalent to two added to one to make one; and in adding two to two to make one, or one to three to make one, the same law in its square is maintained by its conformity to the Law of Three; and every other multiple is a duplication of the original law." [John Dalton]

See Also

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Becoming
Celestial Radiation
Terrestrial Outreach
Three
Triangle
Triangle Down
Triangle Up
6.4 - Sacred Geometry
14.35.1 - Keely 3 6 and 9