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Quantum vortices in helium are almost macroscopic, and can be be imaged in a light microscope:

http://www.aps.org/units/dfd/pressroom/papers/gaff09.cfm

How can vorticity be quantized on such a large scale. The angular momentum in the fluid around a quantum vortex is many, many orders of magnitude more than Planck's constant.

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  • $\begingroup$ Nothing in that article suggests that it is easy to image the vortices. I think the group's method of capturing the vortices on film is pretty clever. $\endgroup$ – Harry Wilson Sep 10 '15 at 16:36

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