The Sphere of Being (Parmenidean Being)

Parmenides argued that whatever truly exists must simply be — it cannot have come from nothing, cannot pass into nothing, and cannot change or move, since any such alteration would mean it once was not or someday would not be. Following pure logic rather than the senses, he concluded that reality is one, undivided, eternal, and complete, balanced equally in every direction "like the bulk of a well-rounded sphere." This austere vision made the world of change and plurality we perceive a kind of illusion, and it became the great challenge that later thinkers — from Empedocles and the atomists to Plato — had to answer.