Difference Maker Alex Cook paints walls, not canvas, with a message of hope and love

The Boston-based artist creates outdoor murals across the US and abroad. 'Art has the potential to save someone’s life,' he says. 'Why be subtle about it?'

Ann Hermes/Staff

Behind a low, unobtrusive brick building on Boston’s Lenox Street is a lush, green forest. Brown and silver-gray trees cover the building’s wall, their leafy canopies blocking the sky. Sun-dappled stones sit on tangles of grass. A boy perches on the largest rock, gazing at a distant meadow.