There's an ongoing debate as to whether the Alhambra features all 17 plane symmetry groups. It would be interesting to see whether Hokusai did. https://en.wiki

There's an ongoing debate as to whether the Alhambra features all 17 plane symmetry groups. It would be interesting to see whether Hokusai did. https://en.wikipedia.org/wiki/Wallpaper_group https://en.wikipedia.org/wiki/Wallpaper_group