What's the deal with the Mona Lisa in 'Glass Onion'?

If there's one thing writer/director Rian Johnson excels at, it's assembling a crew of artists to nail down all those little details when it comes to production design, costumes, and props. While Knives Out had plenty of opulence (and autumnal sweaters), Glass Onion boasts an entire villa decorated with priceless art pieces,...