This video was produced by the same organization that brings us their annual agar art contest each year! I was fascinated to learn how this is done, and hopefully the process will intrigue you, as well!
https://www.youtube.com/watch?v=LXwxU-nIcDY&pp=ygUIYWdhciBhcnQ%3D
This community is for the display and discussion of artwork created by utilizing, depicting, or replicating one or more natural processes. These can include but are not limited to: chemistry, tidal forces, gravity, sediment deposition/erosion, lightning, organic processes, burning, eco-graffiti, pyro-chemography, fractal expressionism, photomicrography, colonization, etc!