both you and paintings are layered… first, ephemera and notations on the back of the canvas. Labels indicate gallery shows, museum shows, footprints in the snow, so to speak. Then pencil scribbles on the stretcher, usually by the artist, usually a title or date. Next the stretcher itself. Pine or something. Wooden triangles in the corners so the picture can be tapped tighter when the canvas becomes loose. Nails in the wood securing the picture to the stretcher. Next, a canvas: linen, muslin, sometimes a panel; then the gesso - a primary coat, always white. A layer of underpaint, usually a pastel color, then, the miracle, where the secrets are: the paint itself, swished around, roughly, gently, layer on layer, thick or thin, not more than a quarter of an inch ever -- God can happen in that quarter of an inch -- the occasional brush hair left embedded, colors mixed over each other, tones showing through, sometimes the weave of the linen revealing itself. The signature on top of the entire goulash. Then varnish is swabbed over the whole. Finally, the frame, translucent gilt or carved wood. The whole thing is done.
Steve Martin, An Object of Beauty
art, beauty, painting