Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       particles
         elementary particles
           elementary bosons - elementary particles with integer spin
             gauge bosons - force carrier particles
               photon - electromagnetic force carrier particle
                 (Phenomenon) electromagnetic radiation
                   1 (Phenomenon) radiowave radiation
                   2 (Phenomenon) microwave radiation
                   3 (Phenomenon) infrared radiation
                   4 (Phenomenon) light
                   5 (Phenomenon) ultraviolet radiation
                   6 (Phenomenon) x-ray radiation
                   7 (Phenomenon) gamma radiation