Really, it’s Schrodinger’s Wall at this point. It hasn’t been built yet, but it’s mostly finished; it’s both a Concrete Wall and a Steel Slat Barrier; Mexico will pay for it, Mexico has already paid for it, it’s paying for itself with NAFTA which has now been repealed, the Democrats must pay for it, it’ll be paid for with “Shutdown Money” saved from the shutdown that’s more expensive than the Wall will ever be, which is supported by federal workers who are mostly Democrats but also want Trump to keep it shut down until the Wall is paid for; it’s needed to stop the Caravans that have already been stopped, and there are no more Caravans coming even though word is there’s one on the way right now; and if there’s no wall, we’re going to have to shut down the entire border with the wall that does not exist.
The Wall currently exists in a state of quantum flux where attempting to observe it only changes its nature.