the dutch concentrated 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; some used copper plates, usually recycling plates from printmaking. in turn the number of surviving golden age paintings was reduced by them being overpainted with new works by artists throughout the 18th and 19th century – poor ones were usually cheaper than a new canvas, stretcher and frame. there was very little dutch sculpture during the period; it is mostly found in tomb monuments and attached to public buildings, and small sculptures for houses are a noticeable gap, their place taken by silverware and ceramics. painted delftware tiles were very cheap and common, if rarely of really high quality, but silver, especially in the auricular style, led europe. with this exception, the best artistic efforts were concentrated on painting and printmaking.