sentences: if something is one color at one time and another color at another time, then that something changes color
docs: red is color. color_and_colour is two_spellings_of_same_word. things has colour red is colored_thing. shade is color. change is when_one_thing_becomes_another_thing. gray_thing is colored_thing. change_of_color is change_of_state. red_thing is colored_thing. coloring is change_of_color.