Christopher Mack has a passion for art, especially in the form of tattoos because he believes that it is the best form of self-expression, with the dedication of the lasting imprint that tattoos have on individuals. (U.S. Marine Corps photo by Lance Cpl. Margaret Gale) - Christopher Mack has a passion for art, especially in the form of tattoos because he believes that it is the best form of self-expression, with the dedication of the lasting imprint that tattoos have on individuals. (U.S. Marine Corps photo by Lance Cpl. Margaret Gale)