Natura - nature actualia - actual entities Mundus Plinius - physical world [Sphaerae - spheres] 1 [Ὄλυμπος - region of the stars] 2 [κόσμος Pythagoras - region of the sun, moon, and planets] see [unranked] Mundus Plinius 3 [οὐρανὸς Plato - region of the air] see Region Caelum veter.