"Human Hand Controlling Bacterial Biofilms" by Lydia-Marie Joubert

http://med.stanford.edu/news/all-news/2014/02/give-her-a-big-hand-joubert-wins-illustration-prize.html A hand photograph superimposed with "micrographs of cultured biofilms" -- green are those resistant to antimicrobial treatment and red are those that have been "vanquished".

Certainly gets the point across!

Picture of handl