“[T]he third rule is {{w|erosion control}}, so just as a hill needs rocks or trees... to slow... the pace of the water.., the wall needs... on a bigger level.., speed breakers... on the {{w|façade}}, and... on the micro level you have... {{w|straw}}, and... if... {{w|rammed earth}} you have stones... so that the façade is... self-healing. They are extremely strong and there is no {{w|cement}} in it except in the foundation.”