The Dutch Album
...heavily on the "lower" categories, but by no means rejected the concept of the hierarchy. Most paintings were relatively small – the only common type of really large paintings were group portraits. Painting directly onto walls hardly existed; when a wall-space in a public building needed decorating fitted framed canvas was normally used. For the extra precision possible on a hard surface many painters continued to use wooden panels, some time after the rest of Western Europe had abandoned them...