Actual video in macro slow-motion of a blob of ferrofluid. Ferrofluid was developed in 1963 by a NASA scientist as a potential rocket fuel because its magnetic properties make it frictionless. I can attest having played around with it that its smoothness borders on obscene. You should get some. The spikes form when the fluid takes the shape of magnetic field lines. And the blob is 2-3 inches long.

Music for Wonder Science by KRON.

Proceeds will be shared with the musicians, and I'll donate 10% of sales to carbon-offset program