Colored droplets in corn syrup seemingly blended together can be returned to their original state by reversing the direction of mixing, a form of laminar flow called "Stokes flow".
Video credit: UNM Physics & Astronomy
Further reading: https://en.wikipedia.org/wiki/Stokes_flow
This is laminar flow, which in a very simplified manner of speaking, means "no mixing". Laminar, as you might sus out, means layers (think laminating a paper, and then laminating it again, or laminated flooring). The layers don't mix with each other.
This is opposed to *turbulent* flow, in which layers do get irreversibly mixed up. If the demonstration turned that handle too fast, it would go turbulent, and you wouldn't be able to reverse it.
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