Low-key lighting is the technical opposite of the high-key arrangement, because in low-key the fill light is at a very low level, causing the frame to be cast with large shadows. This causes stark contrasts between the darker and lighter parts of the framed image, and for much of the subject of the shot to be hidden behind in the shadows. This lighting style is most effective in film noir productions and gangster films, as a very dark and mysterious atmosphere is created from this obscuring light.