Public Art is a topic that would, at first, seem pretty easy to discuss. For Alex and Will, however, it becomes somewhat convoluted the more questions they ask. One public art project that gets lots of people talking is the temporary art commissions that sit on Trafalgar Square's empty fourth plinth. With this year's shortlist of proposed artworks just announced, Alex and Will try to grapple with the subject by enlisting the help of Professor of Public Art & Computation, Andrew Shoben, Listings Advisor for Historic England, Posy Metz, and the artist behind one of this year's proposals for the Fourth Plinth, Michael Rakowtiz.