or ‘Printing Mistakes’, inspired by printing errors found in newspapers. Fascinated by the relationship between the random mistake and the original image, Polke would enlarge and manipulate the distorted newsprint. He then paints the image onto a polyester surface with the aid of a projector, and coats it in layers of resin. Buried within this elaborate surface are sheets of gold mesh, creating yet another filter through which the image must be read. In a few cases, Polke "manufactured" these so-called mistakes; the elongated figures in Aus 'Lernen neu zu Lernen' (From 'Learning to Learn Anew') (1998) are the result of his having dragged a picture through a photocopier. In 2002, Polke developed a new technique of ‘machine painting’. These are his first completely mechanically-produced paintings and are made by tinting and altering images on a computer and then photographically transferring them onto large sheets of fabric. Up until this point Polke had rejected mechanical processes, preferring to explore the visual effects of mechanical technology by hand. From 2007, Polke continued to develop and refine his "Lens Paintings" series. The conceptual framework of the Lens Paintings is grounded in theories set forth by monk Johann Zahn in a 1685 book on a "teledioptric artificial eye", a forerunner of the telephoto lens. Polke's painted "lens" generates a variety of distortions, mutations and spatial illusions when seen from different viewpoints. Films When asked to participate in Konrad Fischer's museum exhibition "Konzeption/Conception" (1969) at Museum Morsbroich, Polke suggested he make a film in which he scratches himself and uses a pendulum. The resulting film Der ganze Körper fühlt sich leicht und möchte fliegen (The Whole Body Feels Light and Wants to Fly) (1969), made in collaboration with Christof Kohlhöfer, is a 35-minute piece in which, Polke scratches himself and uses a pendulum. He also reads from the esoteric 19th-century grimoires The Sixth and Seventh Books of Moses (almost inaudibly as he keeps giggling all the time) and poses as the letter X, with parallel lines of white string connecting the legs of his trousers with the arms of his shirt. Commissioned works For the reopening of the Reichstag in Berlin in 1999, Polke created a series of large, three-dimensional lightboxes. Lighted from behind, images seen through the grooved surfaces of these lightboxes change as the viewer moves past them. Drawing on his early glass-painting training, Polke realized a series of stained-glass windows for