Suminagashi is defined as "floating ink" - an artistic process originating in Japan in which paper is printed upon a bed of water in which ink has dropped to create unbelievable marbling textures. I've been perusing the visual treats of @ArtMarbling for examples and other various outlets to learn more. Watching Youtube examples is both entrancing and calming.

When you've had your fill of Suminagashi, you can dive into Turkish paper marbling, equally as fascinating but with very different results.