Ὁ κόσμος σκηνή, ὁ βίος πάροδος· ἦλθες, εἶδες, ἀπῆλθες → The world is a stage, life is your entrance: you came, you saw, you departed (Democritus fr. 115 D-K)
ball: P. σφαῖρα, ἡ.
disc, round body: P. and V. κύκλος, ὁ.
the earth: P. and V. γῆ, ἡ.
the inhabited world: P. ἡ οἰκουμένη.