As their vintage ad says
"Color-Accent" is achieved by placing color behind an open-back escutcheon to contrast with door surfaces, harmonize with adjacent walls, or complement any part of the doorways. Schlage's original open-back stylings let you create the effect - by applying your favorite paint color, cutting a texture to size, or even placing a leftover piece of wallpaper behind the lock. The possibilities are unlimited and you are the designer.This designer decided to leave it plain and it still looks fantastic. While I love it, I think we'll stick with the Mad Men door knob plan.