The Yanks are call it a "concrete caterpillar". It is already 2km long, and is intended to protect a Sunni neighbourhood from attacks by Shia militia.
Here's the kicker, though: AFP's reporting that the Baghdad city council is hiring artists to paint "calming landscapes and scenes" on the wall, "depicting Iraq's natural beauty."
Shia leader Moqtada Al Sadr, meanwhile, has other ideas: "Draw magnificent tableaux that depict... sedition, car bombings, blood that (the US) has brought upon Iraqis."
Where the hell is Banksy when you need him? He did a heck of a job with the Israeli wall.
Photographs from www.banksy.co.uk