HT2349 - Photography Under Glass

I mentioned the other day that I had visited the Fenimore Museum near Cooperstown, New York. One thing that struck me as I wandering through the museum was that there was only one medium that was protected under glass — photographs. Also on display were paintings, sketches, etchings, prints of many varieties of media, but only the photographs were framed under glass. Is there a reason for this, or is it simply convention? This, in fact, was the topic of my very first Here's a Thought commentary back on March 1, 2019.