From Titanic shame to pride, grief to celebration, and from boom to slump to boom again&mdashBelfast&rsquos reinvention is happening at the speed of&hellipwell, twenty-two knots. That was the velocity of the &ldquopractically unsinkable&rdquo RMS Titanic before her fatal encounter with an iceberg on April 15, 1912. Since then, the Titanic has remained largely submerged in our consciousness, only to surface occasionally in books and movies. But a hundred years has changed all that. Today Belfast, where the ship was built, is going to town commemorating the incident and inviting visitors to experience the city through the prism of the Titanic.