When the Romans arrived in Britain they brought with them the entirely new technology of Corners. Houses prior to the Romans had no corners at all and were largely unsuccesful. Unfortunately for the native Britons the Romans took the secret of corner building with them when they left and the art was not re-discovered until late in the 1600's when two stonemasons building seperate walls perpendicular to one another accidentally crossed paths and made the first corner the British Isles had seen in over 600 years.