If you’re guilty of dropping cigarette butts around New York City, you could be part of a permanent display at the Wellcome Collection in London.

Heather Dewey-Hagborg is the artist behind the art display, Stranger Visions. The American artist trawled the streets looking for anything harboring DNA, including cigarette butts, chewing gum, and hair for this project.

The idea was to use art to call attention to “the potential for a culture of biological surveillance” as the technology of forensic DNA phenotyping becomes more routinely used by police.

The resulting art is shocking as Dewey-Hagborg used the DNA she collected to analyze and gain insights into the gender, ethnicity, and even eye color of each stranger. From this, she used face-generating software to build up an idea of what this stranger would look like.

Rather than keeping the stranger’s face on the computer, Dewey-Hagborg brought them to life by using a 3D printer to create life-size full-color portraits.