Let’s start with the question: What’s in the main picture?

Spource: hetgallery via Foter.com / CC BY-SA
Due to the fact that these museums did not get any larger elaborations on the Internet, I had to rely on information on Wikipedia. I attach links. If you know any books about this topic, write. I will gladly reach them.
National Museum of Art in Osaka
Agnieszka Gach