Visual artists such as Robert Buelteman, Ted Hiebert, and Dick Lane have used Kirlian photography to produce artistic images of a variety of subjects. Photographer Mark D. Roberts, who has worked with Kirlian imagery for over 40 years, published a portfolio of plant images entitled "Vita Occulta Plantarum" or "The Secret Life of Plants," first exhibited in 2012 at the Bakken Museum in Minneapolis, and currently being marketed to botanical gardens and galleries across the United States. Additionally, he has experimented with techniques of coloring by hand as well as digitally.