David's piece is acrylic paint on a 12 inch by 12 inch piece of reclaimed wood.

David’s temporary street art is composed entirely of chalk, charcoal and found objects, and is always improvised on location. Most of these drawings have appeared on sidewalks in Ann Arbor and elsewhere in Michigan, but many have surfaced as far away as subway platforms in Manhattan, village squares in Sweden and street corners in Taiwan. Zinn’s chalk work began in 2001 as an excuse to linger outdoors, but has since achieved global notoriety through sharing on the pages of Facebook, Instagram, Huffington Post, Graffiti Art Magazine, Bored Panda, Central China Television, Street Art Utopia, and Archie McPhee’s Endless Geyser of Awesome. His most frequent characters are Sluggo, a bright green monster with stalk eyes and irreverent habits, and Philomena, a phlegmatic flying pig.