Street artist David Zinn's chalk creatures have been inhabiting Ann Arbor, Michigan since 2008. David calls himself an "inveterate doodler and a shameless word nerd" and uses art as a problem-solving tool. What are the problems he solves? Sad-looking street cracks,...

Street artist David Zinn's chalk creatures have been inhabiting Ann Arbor, Michigan since 2008. David calls himself an "inveterate doodler and a shameless word nerd" and uses art as a problem-solving...