|Not suminagashi, of course. This is|
liquid acrylic paint poured onto a
canvas and then interpreted as
That is the Japanese technique - more or less - but it's not the only way to get the result you desire. Pouring liquid paint is a standard way of starting abstract, even figurative works. The marks made with or without the artist's help (e.g. pushing paint round with a stick or brush) are then interpreted.
So is suminagashi art? I found kids websites where they were having great fun creating such paper. My efforts were no better and I expect that a chimp could have done just as well with a little help (the kids got help, too). But let's not get it out of proportion. People are paying fortunes for 'art' made by chimps and elephants. There's stiff competition out there!