In this programme we travel to the busy and oldest-known city in sub-Saharan Africa - Djenne in Mali. Since there is no readily available stone or wood on the edge of the Sahara, the city has been built from what the environment has provided, namely mud and straw. It is here in this city we meet a busy four year old boy called Mama Kayentan and his dad. They both walk with their empty baskets to the dry river bed to collect mud. After collecting the mud they walk home with their baskets full of mud on their heads. It's amazing to see how resourceful they are as they mix the mud with straw to give the mud strength and texture in order and use it to help mend the wall of their home..