The crinkle crankle wall economizes on bricks, despite its sinuous configuration, because it can be made just one brick thin. If a wall this thin were to be made in a straight line, without buttresses, it would easily topple over. The alternate convex & concave curves in the wall provide stability & help it to resist lateral forces. The term is thought to come from Old English meaning zig-zag. Suffolk has twice as many as in the rest of the country.