https:u002Fu002Fyoutu.beu002FYCJXS4hvOsUMany movies adopt a dual tone strategy in many of their scehttps:u002Fu002Fyoutu.beu002FYCJXS4hvOsUMany movies adopt a dual tone strategy in many of their scenes. Why do they use two colors, and not three or four... or one? Watch the video to find out.详情