Wood

"There is one distinguishing feature of all Esu figures: a long phallic hairstyle protruding from the top of the head and often falling down the back of the head. These sculptures portray both the orisa and his or her devotees. The carving, painted black (deep indigo dye) with long strands of cowrie shells descending from its neck or feet, to which are attached carvings of small mirrors, combs and flutes, as well as small bells, represent Esu's ase, the deity's person and power. Esu crosses boundaries, creates trouble for those unwilling to make sacrifice and brings to fruition human hopes and aspirations." -- from Ibeji: The Cult of the Yoruba Twins, by George Chemeche