This text explores the origins and development of meontology, the philosophical study of non-being. The author traces the roots of this concept back to Parmenides and the Eleatics, who defined Being as static and unchanging, thereby relegating the past, future, and motion to the realm of non-being. The text then examines the Atomists' revision of this strict monism. By introducing multiplicity and motion through atoms, they sought to explain the emergence of diverse things as accidental clusters. While this approach accounted for temporality and change, it further separated true being from transitory appearances. The author highlights that although the realm of non-being was effectively discovered, ancient thinkers had yet to fully grasp the necessity of a subjective observer to whom such things appear. Overall, the passage reflects on the early philosophical inquiries into the nature of what is not and how this concept intersects with our perception of reality, movement, and time throughout the earliest history of human thought.