Later architecture (early 21st century) exhibits late modern or postmodern features such as bronze glass, bronze aluminum frames, unadorned geometric shapes, unusual surfaces, and unorthodox layouts. This styling is seen in the Engineering and Computer Science building, School of Management, Cecil and Ida Green Center, and Natural Science and Engineering Research Lab facility (called the Mermaid Building due to its colorful anodized shingles). To provide protection from inclement weather and extreme temperatures, many of the buildings on campus are connected by a series of elevated indoor walking paths also referred to as skybridges.[151]