It's been established that art history and art appreciation, including "history" of current/living artists, is out of scope for this stack. Instead, we're focused primarily on the making of art, the doing.
In recent history (past 6 months or less) we've had a few closures for this reason:
There have been more throughout the stack's history. While this isn't a large number, it's a fairly high percentage of our total close questions.
A perk of adding it as a custom close reason for our stack is that it would help signal to users with the ability to vote to close a reason for closing that's immediately clear. The "off-topic" reason has been used fairly often by users, but to me it's not clear that it's because it's art appreciation/history, nor does it act as a signpost for other users.