Behold, the common housefly — Musca domestica. You know it as a connoisseur of both sugar water and disgusting crap (literally), but this animal is also, deep inside, a sensitive arteest. Human artist John Knuth figured out how to help M. domestica express its passionate, aesthetic side in a series of paintings that exploit basic housefly behavior.
Houseflies "taste" with their feet. Their appendages are covered with chemically sensitive hairs, called chemoreceptors, which means that houseflies spend a lot of time walking around on top of their food. In addition, they can only eat liquids. If they encounter something delicious-but-solid they must first liquify it by slathering it in digestive juices. Finally, because they have to not-exactly-vomit on solid food so often, houseflies also need a lot of liquid in their diet to remain sufficiently hydrated. And that, as this pregnant lady can tell you, means the flies are also using the bathroom fairly frequently.
Knuth puts these rather disgusting traits to work in the name of art by supplying his flies with ample quantities of colored sugar water and lining their cages with canvas. The flies track the colors all over the canvas, in the form of brightly hued footprints, digestive juices, and excrement. The results are much more attractive than you might guess.