A huge mural greets visitors to the Reggie Lewis Track and Athletic Center in Boston. It's a memorial to the building's namesake, who died unexpectedly in 1993. A young Reggie Lewis, wearing his No. 35 Boston Celtics jersey, dominates the middle of the 11-foot-by-14-foot artwork. At the bottom left is a picture of him and his wife. To his right, the face of legendary Celtic Larry Bird. But as young men in sweats and sneakers make their way into the gym, something strange happens.