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SONA GEOMETRY FROM ANGOLA: MATHEMATICS OF AN AFRICAN TRADITION by Paulus Gerdes Polimetrica, 2006, 232 pp. ISBN: 978-88-7699-055-7
The African sona drawings have become standard fare in ethnomathematics, mathematics education, and history of mathematics classes. As an example, here is a frequently depicted lusona (from www.tacomacc.edu/home/jkellerrn/Ethnomath/Sona.htm)
Paulus Gerdes is a well-known ethnomathematician, mathematics educator, and mathematician who, in numerous books and articles, has shown us the mathematics in African art and culture. In Sona Geometry, Gerdes reveals the sophisticated mathematics underlying the sona.
Sona Geometry begins with ethnographical data about the Cokwe people and the sona tradition....