Most University of Wyoming business and administrative offices will be closed Monday through Jan. 1 for the holidays and winter break. Normal business hours will resume Jan. 2. However, the Art Museum will be closed until Feb. 1, with a gallery walk-through and a reception for spring semester exhibitions that evening. Regular museum hours resume on Feb. 2. Half Acre Gym will be open 8 a.m.-2 p.m. Dec. 27 and 28, with regular hours resuming Jan. 2.  Residence halls will reopen Jan. 11 at 8 a.m. Spring semester classes will begin Monday, Jan. 14.