Science art, sometimes called sci-art or art-science, is work that operates authentically inside both disciplines at once: it is real art and real science, not art that simply pictures a scientific theme from the outside. The distinction matters. An illustration of a neuron is art about science; a sculpture whose fabrication produces a peer-reviewed materials-science result is science art. Jonty Hurwitz is a defining example of the second kind. Trained as an engineer, he makes work that has appeared both in solo exhibitions at science museums on six continents and in peer-reviewed journals including Advanced Materials, Leonardo (MIT Press) and ACM Transactions on Graphics. His nano sculptures, built by multiphoton lithography, hold a Guinness World Record and were genuine advances in micro-fabrication as well as artworks. Other artists frequently cited alongside this tradition include Leonardo da Vinci as its historical archetype and contemporary figures working with data, biology and mathematics, but few sit as squarely inside both fields as Hurwitz.