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A drop of ferrofluid
...is actually a photograph of a 3 cm drop of ferrofluid, a suspension of magnetite in oil. As Frankel explains in her book, Envisioning Science - The Design and Craft of The Science Image - the drop of ferrofluid "was placed on a glass slide," beneath which are a yellow Post-it and seven circular magnets. If one looks carefully at the photo, shot using a 105 mm lens, one can see the photographer's reflection in the droplet.
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