Introduction: the crossroads of mathematics and culture -- African diaspora: cornrow hair braiding -- Guatemala: math of the Maya -- Brazil: the streets of Ouro Preto -- Southwest United States: American Indian beading and weaving patterns -- Ghana: Adinkra symbols -- Germany: the game of Klappenspiel -- Urban areas: graffiti shapes and styles -- South Pacific Islands: stick charts and woven fronds -- India: rangolee and kolam folk art designs -- Bulgaria: embroidery patterns -- Northeast United States: two-sided dice of the Potawatomi.