The Charles Shipman Payson Building, the big brick building that is at the heart of the Portland Museum of Art, is celebrating its 30th birthday this year. I'm generally not a fan of blank walls in an urban environment, but the exterior of this building doesn't bother me too much. It was designed by architect Henry N. Cobb, who has an impressive resume of buildings including Boston's John Hancock Tower and Los Angeles's Library Tower/U.S. Bank Tower. If you want to check out the Portland Museum of Art on the cheap, admission is free every Friday (not just First Friday) from 5-9pm.