V-flat
Light
Two large boards in a V shape, one side white for fill light and the other side black to absorb light.
A V-flat has a dual function: the white side bounces light back as a large, soft fill; the black side absorbs light and creates "negative fill" for added contrast and depth. Usually built from two 240x120 cm foam boards taped together as a hinge. Cheap to build, very effective in the studio or on location where space allows.
Tools that help with this: