Artists Ai Weiwei and Olafur Eliasson have teamed up to "Moon," a collaborative online public art project that invites visitors to contribute their own ideas and artwork. After a quick account set up process, a rotating digital moon appears that you can zoom in on to interact with other users from around the world and add your drawing or statement to the piece. As the artists state, "We are in this world together. Ideas, wind, and air no one can stop." Check out "Moon" for yourself here.