Cob was made of mud, sand, straw and water. It had a property that it would dry rather sculpturally and still be flexible and malleable. So he could work it with his hands and make fantastic sculptures on the outside of his buildings. On one year he did enormous female genitalia, just for a joke,. He wanted all his buildings to sing and dance. That's all for this episode of The Intelligence. We'll see you back here on Monday.