One thing that I fully internalised only recently - despite learning Asian languages for literally decades. The things western people take for granted as ubiquitous in our culture are often unknown to Asian cultures.
As an example recently talking to a Japanese friend who is the same age as me we realised she had seen less than 10% of the movies that "everyone born in the early 80's has seen". She didn't know who OJ Simpson was, nor is she familiar with Henry VIII and his 6 wives. She knew the Backstreet Boys & One Direction, but not Take That nor East 17.
Traveling in China a few years ago I was surprised to see many Hokusai images used on clothing and shop decorations.
The Mona Lisa might be the western world's most famous artwork, but you rarely see it on a T-shirt unless you're meeting a tourist near the Louvre. I suspect that if both were in still trademarked that Hokusai would be making orders of magnitude more on royalties than Da Vinci...