Convergence zone

A convergence zone is where anything convergence. Of note are cities, since cities tend to be salient historically, where influences converge. Convergence zones are time spirals, as forces of astro-logical bodies meet and form shapes akin to spirals, where one synthesis or anther may tower over the rest.
A time spiral is a convergence zone where the more rarified synthetic products (noble metals) rise to the top; any city or community is an alchemical spiral producing the philosophers stone or elite of society. The respective elite may not however be much, since elite simply means what rises to the top, and because of astrological cycles, that is sometimes scum.
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Social alchemy; The tree; Social tree; Social spiral; Industrial zone; Industrial convergence