The tattooing became a way to "vent, " he said, in his offseasons a few years ago.
Organiser Reno Sammut said the social stigma attached to tattooing was disappearing and the industry was booming.
In studies with mice, tattooing a vaccine produced 16 times more antibodies than a simple injection into muscle tissue.
Mr Sammut said tattooing was a great skill and a position of responsibility.
With no access to colored inks, prisoners use watered-down black ink to create shadows and depth a technique called "fine-line" tattooing.
Its eclectic programme features music ranging from 1960s to electro, and events such as fashion week parties and live tattooing draw in a boho clientele.
In fact, tattooing is an acceptable form of identification for animals and even is one method advocated by People for the Ethical Treatment of Animals.
In this conversation with CNN Medical Correspondent Elizabeth Cohen, Handler discusses firing your doctor, tattooing medical directives on your stomach and the importance of not doing exactly what you're told.
Still, it's the tattooing that really interests Mister Cartoon.
That means no tattooing a boxer's nose to make it more black, no braces for a pointer to straighten its teeth, no removing a basset hound's inner eyelid to improve its appearance.
"I loved the idea of a small part of the city that I call home coming together and using tattooing as the medium for the sake of a community art project, " said Josh Weinel, 36, a participant in the project.
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