Anaximander

He lived in Miletus around the same time as
[Thales](ThalesofMiletus) and [Anaximenes](Anaximenes). His
belief was that *our world is one of the myriads of the worlds that
evolve and dissolve in boundless*\[1\]. However, it is not clear what he
meant from boundless. Perhaps, something fundamental of which the world
is made of, in which before and after the existence the world dissolves
into.

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References:

1.  Sophie\'s World by Jostein Gaarder