levity refraction first that have want / flower to be pulled down / to winter on a sun
double_refraction is refraction. refraction is physical_phenomenon. refraction is not physical_phenomenon. stoplight is lamp. lamp_shade is translucence. light is refracted_by_water. lamp_shade is not translucence. stoplight is not lamp. light is not refracted_by_water. double_refraction is not refraction.