Last February Norwest Bank Minnesota made an announcement that stunned the local arts world; it was donating its world renowned collection of decorative, applied and graphic arts to the Minneapolis Institute of Arts. The collection features rare and significant metalwork, furniture, ceramics, glass, even posters, from one of the most explosive and diverse periods in art history....what scholars call the "modernist" period, between 1875 and 1945. Tomorrow the M.I.A. will unveil part of its prized gift to the public in a new exhibit called "Milestones of Modernism," and Minnesota Public Radio's Chris Roberts has a preview.