It’s Christmas Day and King Arthur’s knights are gathered at the round table, celebrating with the king and queen. The Green Knight, a kind of giant tree-man, rides in on horseback, interrupts the party, and challenges anyone present to a game. Here are the rules: The challenger will be allowed to deliver a blow that the Green Knight will receive without resisting. But first the challenger must agree to seek out the Green Knight in one year’s time and receive without resisting the same blow from him. This is the set-up to the epic poem, “Sir Gaiwan and the Green Read more