Abstract expressionism in 1929 in relation to works by Wassily Kandinsky. Technically, an important predecessor is surrealism, with its emphasis on spontaneous, automatic, or subconscious creation. Jackson Pollock's dripping paint onto a canvas laid on the floor is a technique that has its roots in the work of André Masson, Max Ernst, and David Alfaro Siqueiros. The newer research tends to put the exile-surrealist Wolfgang Paalen in the position of the artist and theoretician who fostered the theory of the viewer-dependent possibility space through his paintings and his magazine "DYN". Paalen considered ideas of quantum mechanics, as well as idiosyncratic interpretations of
Canvas and the 17th century in Northern Europe. Mantegna and Venetian artists were among those leading the change; Venetian sail canvas was readily available and regarded as the best quality. Canvas is typically stretched across a wooden frame called a stretcher and may be coated with gesso before it is to be used; this is to prevent oil paint from coming into direct contact with the canvas fibres, which will eventually cause the canvas to decay. A traditional and flexible chalk gesso is composed of lead carbonate and linseed oil, applied over a rabbit skin glue ground; a variation using titanium