New Scientist TV: Born to be viral: Magnetic field sculptures: "The shape of the metal objects determines the shape of their magnetic fields, which in turn sculpts the fluid, roughly revealing the normally invisible magnetic fields.
In the video you can see fluid bunching up at points, corners, and edges. Johns says this is because magnetic fields tend to be strongest near sharp edges.
Aside from making cool sculptures, ferrofluids could be used as deformable mirrors for telescopes and other optical devices, or incorporated into clothing to make nanotech body armour."
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