Owu mask, Ugwuta (Oguta) area, 1940s. Photo via Sabine Jell-Bahlsen.   The Ogba people of Rivers State and the Oguta people of Imo State also known as the “Riverine Igbo”. (Oru/Olu) which they call themselves and share several cultural similarities rooted in their geographical proximity within the Niger Delta region and their historical ties to the broader Igbo…