When I moved to South Africa last year, I had a vague understanding of the role Nelson Mandela played in ending apartheid and reinventing this country. (Nelson Mandela is often referred to as Madiba, which is his clan name. It took me a while to figure out why people are always calling him that.) It also took a while for me to comprehend the magnitude of Madiba’s impact on the South African people, and on the consciousness and spirit of this country. I’ve been trying to think of a historical figure who has had a comparable impact in the United States. There isn’t one. Two years ago, when Madiba turned 91, his birthday was officially coined Mandela Day — a day to honor Nelson Mandela and perpetuate his legacy worldwide. Mandela Day is tomorrow, 18 July, but the country has been celebrating all weekend. Mandela Day is a big deal around here.