Reviving old buildings requires the work of everyone from plumbers and architects to carpenters and artists. It also requires working around the current condition of the building, and being prepared to deal with whatever you find. This photograph of restoration work on a mural in McMenamins Crystal Ballroom shows some of the issues that the artists faced. They painted on whatever surface they found such as brick or lathe and plaster walls. Because the building was damp and unheated when the murals were originally painted, the paint didn't completely adhere to the walls. Later building work, as well as vibrations from sound systems and general wear and tear eventually required restoration work on the Ballroom murals.