In 1831, dozens of intricately detailed chess pieces—enough to form several sets—were found buried in the sand on Scotland’s Isle of Lewis. They had been carved from walrus ivory in the 12th century. Apparently unused, they may have been the stock of a merchant who buried them after a mishap at sea. Their origin and intended destination are unknown. The rooks are depicted not as castles, but as berserkers. Instead of white and black, the pieces may have been white and what other color? Discuss