If you spin a fluid-filled vessel fast enough, you can get the liquid to form a vortex. Brick Technology wanted to see if they could produce such an effect using LEGO mechanisms, so they created a series of machines to experiment with fluid dynamics. The one at the end is impressively stable for how fast it spins.
Sandro Bocci of JuliaSetLab and Dugong Films creates art by photographing the interactions between liquids, as see through the lens of a microscope. Watch as these puddles of fluids of varying viscosities form patterns that look like the clouds and planets of a distant galaxy.
While unable to travel in 2020, Vadim Sherbakov worked on a project closer to home. The filmmaker created this macro video using inks, alcohol, soaps, and household chemicals, resulting in colorful and ethereal moving images. The entire work was shot with a DJI Pocket 2 camera with a macro lens attached.
The Slow Mo Guys took their pricey Phantom high-speed camera, mounted it sideways, attached a macro probe lens to it, and then focused it inside the vortex created by a self-stirring tumbler. The resulting slow-motion footage is a truly amazing look at fluid dynamics.