The dikenga, also called the yowa or the Kongo cosmogram, is a cross-within-a-circle figure central to the cosmology of the Bakongo of Central Africa and to a number of traditions in the Americas descended from it. Its horizontal line is understood as the boundary between the world of the living and the world of the dead, frequently figured as the surface of water, and its vertical as the path connecting them.
The four points are commonly given as a cycle corresponding to the sun's course: rising, zenith, setting, and the midnight position beneath the world, and thereby to birth, maturity, death and existence in the ancestral realm, followed by return. The figure therefore expresses a cyclical understanding of a person's course and of the continuing relation between the living and the dead. It is a statement about time and community rather than a map of space, and this is the point most often lost when it is reproduced as decoration.
The interpretation most widely known outside Kongo communities is Robert Farris Thompson's. His Flash of the Spirit (1983) presented the cosmogram and traced what he identified as its retentions and transformations across the Americas, in the ground-drawings of Cuban Palo, in marks on colonoware pottery and objects recovered from archaeological sites in the United States, and in a range of African-American practices. Thompson's account has been enormously influential and is responsible for most general familiarity with the figure.
It is also contested. Some scholars have argued that the fourfold interpretation is more systematised than the Kongo evidence will support, that Thompson and his collaborators worked from a limited set of informants, and that crosses and cross-marks in the Americas have sometimes been identified as Kongo cosmograms too readily, where other explanations are available, including Christian ones, given the presence of Christianity in the Kongo kingdom from the late fifteenth century, which makes the cross a doubly available sign in exactly these communities. Others defend the identification and point to the strength of the documented continuities. The debate remains live in African diaspora archaeology and art history.
One boundary should be noted. In initiatory traditions such as Palo, ground-drawings incorporating the figure are made and used in ritual contexts that practitioners regard as closed, and detailed accounts of their construction and use are not appropriate for general publication. What is described here is the cosmological figure and the scholarly discussion of it, not ritual practice.