The function of Nok terracotta sculptures is still unknown. For the most part, the terracotta is preserved in the form of scattered fragments. That is why Nok art is well known today only for the heads, both male and female, whose hairstyles are particularly detailed and refined. The statues are in fragments because the discoveries are usually made from alluvial mud, in terrain made by the erosion of water. The terracotta statues found there are hidden, rolled, polished, and broken. Rarely are works of great size conserved intact making them highly valued on the international art market.