I don’t know if a lot of cities have these, or if they’re more of a border thing.
Low-tech and obvious, but they’re probably meant to be obvious as a deterrent for whatever it is they’re trying to deter. The windows are pimped, so we don’t even know if there is really anyone in there at all. Maybe they’re just decoys.
On another subject, leaning over a jigsaw puzzle is a lot harder on the low back than I recalled, when I thought this was a good idea.