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Iron oxide nanoparticles self-assemble in a droplet of water. The particle arrange in a very appealing pattern due to the coffee ring (or cheerio) effect. This image was a finalist in the Science as Art competition for the Materials Research Society 2015 annual meeting. False coloured. Image courtesy of Dr. S. Kobaku.

When PDMS micro-pillars are sprayed with liquid PDMS resin, they will spontaneously come together and form complex structures. This image was a finalist in the Science as Art competition for the Materials Research Society 2014 annual meeting. False coloured. Image courtesy of Dr. K. Golovin.