There a distinctive difference between color-sorted and color-coded libraries. However, the second may be a subset of the first. But in any case, we'd like to talk about libraries sorted by the colors of their books' covers today.
There are under 50 complete or mostly complete Gutenberg Bibles known to exist today. One of them was a part of William H. Scheide library, that was donated to Princeton in 2015. And it is one of only three books remaining in the original binding.
Those living at the end of the 19th and beginning of the 20th century saw library books in a different light than us. For many, library books had the potential to transmit some of the most infectious diseases circulating in society at the time.
Last week an exhibition of incunables opened at the Russian State Library in Moscow. There are many notable objects shown there, but arguably the jewel of the show is one of the few remaining Gutenberg Bibles printed on vellum.