Vincent Van Gogh's Painting With Tilt-shift Effect

A self-taught artist with little training, Van Gogh was anything but academic in his painting and drawing techniques. Recent research has shown that works commonly known as "oil paintings" or "drawings" would better be described as "mixed-media". The Langlois Bridge at Arles shows highly elaborate under-drawing in pen and ink, while several works from Saint-Rémy and Auvers, hitherto considered to be drawings or watercolors, such as Vestibule of the Asylum, Saint-Remy (September 1889), turned out to be painted in diluted oil and with a brush.
Radiographical examination has shown that Van Gogh re-used older canvases more extensively than previously assumed—whether he really overpainted more than a third of his output, as presumed recently, must be verified by further investigations. In 2008, a team from Delft University of Technology and the University of Antwerp used advanced X-ray techniques to create a clear image of a woman's face previously painted, underneath the work Patch of Grass.