CHIANG MAI, Thailand — From the early 1600s to the mid-1800s, living African slaves would sometimes be thrown overboard from slave ships sailing the Middle Passage, as the transatlantic voyage of the slave trade was called. If the slave ships faced water shortages or any kidnapped Africans came down with a disease, slaves could be tossed overboard, sometimes chained together en masse. “So many bodies of dead or dying Africans were jettisoned into the ocean that sharks regularly followed the slave ships on their westward journey,” according to that encyclopedia entry. In the new film The Water Will Carry Us Home by multidisciplinary artist Gabrielle Tesfaye, those ships are followed by a very different entity: Yemaya, the Yoruba orisha of the sea and the mother of all life. “There are many stories within African spirituality of water spirits following the slave ships, Mami Wata, the presence of Yemaya,” Tesfaye said in an email interview from her home in Chiang Mai, Thailand.