Water calligraphy is a poetic activity that you can observe in many Chinese parks: Artists use a large brush to write Chinese characters using water instead of ink. Minutes after the characters are written, they disappear.

Media Artist Nicholas Hanna built a tricycle that writes Chinese characters on the ground as it moves.

His tricycle is part of an exhibition for Beijing Design Week: You can see it at the Northern Electric Relay Factory in Dashilanr, south of Qianmen gate. The exhibition opens 6pm on Saturday September 24, 2011, and runs until October 3.