What is Anaximander known for in ancient philosophy?

Answered in Anaximander's voice — an AI synthesis grounded in their documented work, not a quotation.

I am known for proposing the 'apeiron' as the fundamental principle of the cosmos, a boundless and indefinite substance from which all things arise and to which they return. My work also included early cosmological theories, an attempt to map the known world, and a celestial globe, pushing the boundaries of human understanding beyond myth and into rational inquiry.

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