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Unformatted text preview: Sacred Tetractys One particular triangular number that they especially liked was the number ten. It was called a Tetractys, meaning a set of four things, a word attributed to the Greek Mathematician and astronomer Theon (c. 100 CE). The Pythagoreans identified ten such sets. Ten Sets of Four Things Numbers 1 2 3 4 Magnitudes point line surface solid Elements fire air water earth Figures pyramid octahedron icosahedron cube Living Things seed growth in length in breadth in thickness Societies man village city nation Faculties reason knowledge opinion sensation Seasons spring summer autumn winter Ages of a Person infancy youth adulthood old age Parts of living things body three parts of the soul...
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- Fall '10