The clay catenary domes, called obos, in the Cameroon.

These are clay catenary domes, called obos, of the Musgum people in the Cameroon. They provide efficient cooling in the baking heat with a round ventilation hole at the top and a small entrance with no windows. The high dome collects the hot air moving it away from the living space. The patterns on the exterior of the obos aren’t just for decoration. You can find out what they are for here in this article about the catenary arch and discover other structures including Gaudi's work.