Berman created her "paint" at Genspace, a community biolab in Brooklyn, by injecting DNA that codes for fluorescent proteins into a nonpathogenic strain of E. coli. She found that by mixing her genetically modified bacteria, she could produce different hues. After four months of daily experimentation, Berman chose a palette that included green, red, yellow, and cyan. She smeared the bacteria onto large plastic sheets to create images of the human endocrine system, which she displayed at her senior thesis show in May 2015. But unlike real paint, Berman's bacteria begin to die once they leave the petri dish—now, her art has become entirely invisible.