The Cleveland Museum had a big week of life-changing announcements. “First came the awe: After a decade of planning, the museum’s 26 voting trustees agreed unanimously on Monday to go ahead with a visually stunning, $258 million expansion and renovation designed by Rafael Vinoly of New York. Now comes the shock: The six-year construction process, which will start in September, means that the museum’s spectacular permanent collection will be off-limits and out of sight for at least several years.”