This is more secco than fresco, but it hardly matters how the wall ended up as this—to my eye—aesthetically beautiful work of art. Fresco is a technique where pigment, using water as a medium, is applied to wet plaster, so that when the plaster sets, the paint becomes an integral part of the wall. Secco is done on dry plaster and needs a medium such as tempera to make the pigment stick to the wall. I can hardly imagine that the Renaissance painters would share my appreciation of this cracked, chipped and crazed masterpiece, but fortunately they are not here right now to fix it.