The opá iku is applied when praying the moyuba (mojuba) to the ancestors, by tapping it on the bottom to contact up Egun to get present. Inside the Yoruba homeland, the tapping of this staff was practically done on top of the graves with the buried ancestors in the home https://bloomberg97520.bloggactif.com/29508529/the-greatest-guide-to-what-is-the-congolese-spirit