
To create this image I cut a hole in a fish tank and made an external reservoir to hold the food coloring dye. The reservoir had a rubber membrane on the outermost side of it so it could be depressed to generate the toroidal vortex ring.
To create this image I cut a hole in a fish tank and made an external reservoir to hold the food coloring dye. The reservoir had a rubber membrane on the outermost side of it so it could be depressed to generate the toroidal vortex ring.