Look for the green penguins. A flock of them, recycled plastic by the Italian collective Cracking Art, turns up all over 21c — and green because NWA residents picked the color for the region. They anchor a contemporary-art museum on the northeast corner of the square, about 12,000 square feet of rotating shows that stay free 365 days a year, threaded through a boutique hotel and The Hive restaurant. Living art dropped into the middle of a working downtown block.