Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       Astra Plinius - celestial bodies
         Universe
           Virgo-Hydra-Centaurus Supercluster
             Virgo Supercluster
               Local Group
                 Milky Way Galaxy veter.
                   Orion Arm
                     Local Bubble
                       Local Interstellar Cloud
                         Solar System
                           Earth System
                             Earth veter.
                               "spheres" (Earth)
                                 Atmosphere (Earth) - layer of air
                                   Cyclones
                                     2004 Atlantic hurricane season
                                       Alex (31 Jul 2004 - 6 Aug 2004)