They're each about the size of an A3 sheet of paper, and they show figures in high relief that celebrate the battles won by the army of the Benin ruler, the oba, and the rituals of the oba's court.

Image caption, This brass plaque shows the Oba, or King, of Benin and his attendants. Why do you think the Oba is shown to be much bigger than the other people? The plaque is on display at the ...