There is a peculiar shade of blue that pervades certain parts of Accrington. Not always seen, it can nevertheless be sensed as a strong visual memory over long periods of time and sometimes in other places, far removed from this former manufacturing town in East Lancashire. The blue can be put to various uses. In modern parlance, it is a “positive” force. And the curator invoked it at various times during that strangest of decades, the 1990s.