Sona Geometry from Angola: Mathematics of an African Tradition (color edition)The sona tradition belongs to the culture of the Cokwe and related peoples in Eastern Angola and neighboring areas of Northwest Zambia and the Congo. Observers have described sona as sand graphs, sand drawings, drawings in the sand, writing in the sand, pictographs and ideograms, and as a system of communication. The sona tradition is multifaceted. It comprises aspects that are philosophical, educational, artistic, ideographic, and recreational. The