Zachary Copfer, "a microbiologist masquerading as an artist," calls his craft bacteriography. That's creating photographs in petri dishes. He writes:
During my graduate research I invented a new medium that combines photographic process with microbiological practices. The process is very similar to darkroom photography only the enlarger has been replaced by a radiation source and instead of photographic paper this process uses a petri dish coated with a living bacterial emulsion.
Pictured above are his portraits of Albert Einstein, Leonardo da Vinci and Charles Darwin.