The Walker Art Center is arguably the dominant institution in Minnesota’s arts scene, which is quite an accomplishment for a relatively small, quirky modern art museum housed in a decidedly dated modernist building. There are more glamorous museums in the Twin Cities, but Minnesotans love the Walker, with its claustrophobic stairwells, leaking skylights, and bare, unadorned concrete decor. On Valentine’s Day, the Walker will close for a year-long renovation and addition which will forever change its distinctive look and cramped feel. The renovation is a good thing, says Mary Abbe, but she’ll miss the old Walker.