Randhawa Light-Box
A large wooden or cardboard box with a different design cut into each side. A light is placed inside in order to create patterned shadows. The Randhawa Light-Box is usually used on very low budget film sets with simple lighting kits. Some contain coloured gels. Named for its creator, a Canadian filmmaker.
That wall looks awfully plain, use the Randhawa Light-Box to cast a shadow.