For a decade, illustrator and street artist David Zinn has been adorning the pavements of his neighbourhood in Ann Arbor, Michigan, with chalk drawings of animals interacting with their surroundings. They began as a diversion from his commercial art projects, but he soon found that their temporary, childish, and anonymous nature took away a lot of the ego and anxieties of being an artist. The drawings are in public spaces but are almost invisible to passersby, as many only make sense from one angle. The people who do notice are often surprised, Zinn says. Cheerful art isnt as common as it could be, and rewards for looking at the ground are few.