The Massachusetts Museum of Contemporary Art was already pretty darn huge when it opened 18 years ago with 90,000 square feet of exhibition space in a re-purposed, 19th-century mill complex in North Adams. Its exhibition girth grew even more in 2008 when the institution renovated what’s known as Building 7 to display floors filled with large-scale wall drawings by the late conceptual artist Sol LeWitt. Now, as part of the museum’s ongoing expansion and mission, MASS MoCA’s gallery capacity is doubling with the debut of Building 6 which opens Sunday. Read more about the debut of Building 6 >>