Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       particles
         elementary particles
           elementary bosons - elementary particles with integer spin
             gauge bosons - force carrier particles
               1 photon - electromagnetic force carrier particle
               2.1.1 W+ boson - weak interaction carrier particle
               2.1.2 W- boson - weak interaction carrier particle
               2.2 Z boson - weak interaction carrier particle
               3 gluon - strong force carrier particle