Many background sets from the original Star Wars trilogy were just oil paintings
Between the 1970s and 1980s, before photorealistic computer graphics became an ordinary thing, elaborate background sets in movies were hand-painted. These pictures were called matte paintings, and artists created them by painting landscapes onto glass using oil, acrylics, or pastels.
Among many other popular films, the original Star Wars trilogy contains dozens of matte paintings that display breathtaking backgrounds. The fans of this movie series would be surprised to know how many scenes were possible thanks to this unique kind of art.