Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       Astra Plinius - celestial bodies
         Universe
           (Supercluster) Virgo-Hydra-Centaurus Supercluster
             (Supercluster) Virgo Supercluster
               (Cluster) Local Group
                 (Galaxy) Milky Way Galaxy veter.
                   (Spiral arm) Orion Arm
                     0 (Region) Local Bubble
                     2 Auriga-Perseus Cloud
                     3d425 Region Pleiades Bubble
                     4 Taurus Dark Cloud
                     5d330 (Region) Loop I Bubble
                     6d420 (Region) Loop II Bubble
                     7 (Region) Loop III Bubble
                     8 Region GSH 238+00+09 Heiles, 1998