https://en.wikipedia.org/wiki/Ultramarine
See Sassoferrato's Madonna:
https://commons.wikimedia.org/wiki/File:Sassoferrato_-_Jungf...
Turner and Van Gogh used this special Indian Yellow, imported from India, and made from the urine of cows fed mango leaves.
https://hinduaesthetic.medium.com/the-mystery-of-the-origin-...
A painter's commission would say "...And such an such an area of ultramarine", the better to show off the buyer's wealth and status.
Also for example the one of greatest work by Aivazovsky https://en.wikipedia.org/wiki/The_Ninth_Wave#/media/File:Hov... Here the fractal structures at the tops of the waves are the major elements delivering the feeling of the raging water, the main point of the picture.
Do you have links to any of them? Is love to see others that are considered great.
A lot of Hokusai's work branched out as did some mode modern woodblock artists.
This is hardly unique to Japan. Look how many Madonna and Child or Crucifixion scenes there were in Renaissance paintings.
There were also a lot of prints of this thing, which means many museums can have a print and display it, so it reaches a larger audience that way, too. Visitors to LA, NY, Chicago, London, Brussels, and more have always been able to see a print.
From there, the image of the Great Wave exists in merchandising, which the article also mentions. Uniqlo made a shirt with the image printed all over it.