Filmtips:
In cinema, butterfly is a methodology of lighting sets. When controlling light, grips use a variety of flags (black, opaque material), nets (one, two, or three layers of black, white, or semi translucent bobinette), and diffusion (translucent white materials of different densities). Generally, these are sewn onto frames of standard sizes, which are kept in racks or on carts where they are easily accessible. However, when a flag, net, or diffusion is needed to cover a larger area it is not practical to keep it built and sewn on the truck; thus, Butterflies.