when zero mean of matter toes into another mean of matter , the item regions of matter is variable
zero_dimensional_thing is spatial_thing. dark_matter is substance. tad is small_indefinite_quantity. zero_dimensional is dimensional. matter is trouble. grey_matter is solid_animal_matter. solid is state_of_matter. geometrical_plane_figure is finite_surface_region. finite_surface_region is finite_spatial_thing.