Could the biggest of President Trump’s campaign promises become a reality? Experts have suggested the construction of a wall along the U.S. border with Mexico is impractical. Never mind the eminent domain battles with ornery, pricklier-than-a-saguaro Texans who own land along the border, what about us having to toss Mexico’s soccer ball back to them every time it gets kicked over the other side?

Below, a breakdown of what the wall could cost, in terms of both dollars and sense.