Preparations for the background begin in the field, where an artist takes photographs and sketches references pieces. Once back at the museum, the artist has to depict the scenery with as much realism as possible. The challenge lies in the fact that the wall used is curved: this allows the background to surround the display without seams joining different panels. At times the wall also curves upward to meet the light above and form a sky. By having a curved wall, whatever the artist paints will be distorted by perspective; it is the artist's job to paint in such a way that minimises this distortion.