Round vault doors from the 1900s up to their falling out of fashion (1960s?) almost always show off their wonderful boltwork behind glass panels. Even some of the later rectangular doors did. But a few of the round doors partly obscured the mechanism, see for example the Cleveland Federal Reserve Bank, Federal Reserve Bank of Cleveland - Wikipedia, the free encyclopedia, and the door in Denver's Broker restaurant, The Broker Restaurant for Fine Dining in Denver Colorado and All sizes | Bank vault dining | Flickr - Photo Sharing!.

I don't know if this was purely style or if there was some other motivation. Today's mechanisms are so blandly functional and unimpressive I'm glad they cover up everything.

Any comments?