Interesting fourth century AD Roman dice tower.
It is an upright, hollow cuboid of copper-alloy plate designed to sit level on a flat surface. The top of the dice tower is open, allowing for the introduction of dice, and it contains three levels of projecting baffles which would produce random motion in the dice as they fell through the tower. The dice would then emerge at the base of the tower via a miniature flight of steps. The dice, while emerging, would ring three bells which formerly hung above the exit. One of these bells survives intact.