In any event, the authorities had enjoyed a monopoly over the production and use of such weapons until sometime in the Second Millennium, when the number of widely separated habitats, and resulting political fragmentation, led to a situation in which the civil authorities from Habitat A might actually have cause to shoot at those of Habitat B. The number of different types of katapults and ambots, and of the defensive measures used against them, exploded. No complete catalog of types had existed for thousands of years. Here and there one might stumble across a museum display in which a few dozen or even a few hundred types of ambots had been rendered inert and mounted to a wall with explanatory plaques beneath them explaining in what millennium they had been invented, by whom, and in which habitat they had been used to prosecute this or that disturbance. But everyone knew implicitly that such displays only included samples that had at random made their way into a particular collector’s drawer.