Paper marbling is an ancient art, in which droplets of paint are floated in a viscous solution, combed, brushed, and blown upon, then carefully transferred to paper to create a unique monotype print. And as filmed by director Oguz Uyguy, it's the most beautiful, hypnotic form of design I've ever seen.
Every single drop, you think to yourself: no, no more! It's perfect! Don't change another thing! But then the marbler does, and the pattern becomes even better than before. Watching it is both relaxing and agonizing. See for yourself:
[h/t: Sploid]